This mouse is so close to being great but misses the mark.

Pros:
I bought this mouse because I liked the
-shape,
-button location,
- and 1000hz report rate.
There's still nothing wrong with these features.

But it has two issues that in my mind make it not great.
Cons:

1) weight: This is a heavy mouse. especially with a battery installed. If you like that then go ahead. I like a light weight mouse so that's a problem for me. I'm actually running it wired with no battery (or battery cover) for weight.

2) I wanted a wired mouse and this one claims to give the option of wired or wireless. BUT the cable it comes with is so stiff it actually resists mouse movement and makes gaming harder, so i ended up using it wireless for a while (see bonus con 3). Fortunately it's just a standard micro USB cable so I dug through my bin of cables until I found a softer one and it works great. But really, why go through the trouble of making a custom cable with a funny shaped end and then use stiff insulation and wires?!

3) bonus con: The battery life is awful. I don't really count that against the mouse because I knew that going in and never intended to use it wireless. But it is really bad. I can't get one evening of gaming + idle + web browsing without the battery status going red. And if you run it with a cable and no battery it just sits there blinking a red light at you constantly.

EDIT/UPDATE:
con 4) I can now add that Logitech support is pretty awful. I had some trouble with their software and hardware and it can take days or even a week + to get a response. On top of that the responses are unhelpful and written in broken unintelligible English and either answer no question at all or answer a question I didn't ask.

con 5) I recently tried binding all the thumb buttons and found out that if you press the bottom front thumb button hard enough (not that hard mind you) the top front button also triggers. This is pretty bad for obvious reasons.

A very good gaming mouse with multiple OS support.
However the battery life is nowhere near the advertised amount.
I do not even get through a workday (approx 6 hours) of general use without needing to recharge the battery.
In fact the most frequent notification I receive on my computer is that the mouse is at 25% battery life remaining.
Even with a non-rechargeable one I only get slightly more time.
In fact I have given up and am using it as a corded mouse since the hassle required to recharge so often negate the wireless convenience.

All that being said this is a very comfortable, configurable and precise mouse.
The responsiveness is impressive wired or wireless, without lagg or hesitation.
It easily passes the 180 degree flick test which lesser mice cannot do.
The quality and responsiveness is the same wired or wireless which speaks volumes to the technology Logitech has been able to bring to wireless mice.
The software is powerful and easy to use.
The selection of game title configurations available for download is impressive and I have yet to find a game I own that is not available (some being almost 10 years old).
The cross platform compatibility of the software is welcomed as someone who used Windows and Mac computers.

So in the end the question is would I buy it again?
Probably not. As good as it is wirelessly the short battery life rule out using it as a wireless gaming mouse.
And there are wired gaming mice (some by Logitech as well) that perform just as well and a lower price.

I got this mouse because I had a crappy chinese off brand gaming mouse that I hated and it wasn't easy to transport because it was wired. I got this mouse because there was a deal where I could get it for $56, almost 50% off the normal price of $100.

Pros:
-Very comfortable to hold if you find the right grip
-Tilting scroll wheel (I don't knock my scroll wheel very often so this was a nice feature to have)
-Every button except the infinityscroll can be reprogrammed so if you want to play a prank on a friend who has this mouse, You could program every button to the windows key so the start menu opens whenever they click a button on the mouse as a prank
-Rechargeable with replaceable battery and you can charge it on the mouse's micro USB port so you rarely have to remove the battery except to replace it every few years but DO NOT PLUG IN A STANDARD ALKALINE BATTERY. It may work but instead of being able to charge it, you will eventually cause a fire plugging it in. Only use NIMH rechargeable AA batteries because that is what Logitech recommends
-The infinityscroll is super useful when you need to get to the bottom of a forum thread to see if there are any responses or scrolling to get to the sitemap at the bottom of most websites.
-The hydrophobic coating not only works, it works well. I wet my finger under the faucet (not with the way you think if you are perverted) and most of it slid right down the side but not all of it. I did get my finger really wet (again, not the way you think) so I am still impressed. The rest came right off with one wipe of a paper towel (on the mouse, not where you think if you are at it again)
-Tracks pretty well on almost every surface. My crappy wanna-be gaming mouse couldn't even track at all on my mousepad, marble and real wood tables while this one tracks on my mousepad, marble and I haven't tested it on a wood table and I would expect it to have some difficulty with that because the laser can't sense very far. My crappy excuse for a mouse I had before actually would perform better at that because I could hold it 6 inches above my desk and it would work but I don't know a single person who uses their mouse slightly above the desk or any real mouse that is made for that. (Razer's project Mcfly was a joke but that would be a great gaming mouse because the resistance of sliding it across the surface would be eliminated for faster movement *hint hint)
-Amazing unboxing experience. Definitely different than what you would usually find but they made it work. Somehow, the first thing you see is the mouse but it is the last thing you take out works. Plus, you get to see the accessories that you will never use like the USB extension, and the manual, and the USB extension, and the USB extension and especially the USB extension. Did I mention the USB extension?
-Unlike literally every other wireless mouse on the market, there is almost no latency over wireless. There is actually even less latency than most wired mice. It performs the same when used wired which I should probably mention,
-You have an option to use wired. The battery adds a lot of weight to the mouse making it significantly heavier than most gaming mice. Doesn't really slow me down but if that is going to slow you down, you can pull out the battery and use it wired with a micro USB cable.
-SO MANY BUTTONS!!!

Cons:
-The tilting scroll wheel does not default to sidescrolling. Not that big of an issue considering you can program that easily so I am not going to lower the rating but still a bit disappointing.
-Hard to find a grip comfortable for you but once you find it, you never have to worry about it again so not enough to take a star off.
-The side material is not as grippy as I would like but still does the job very well and I would assume it is hard to make a hydrophobic coating or rubber so not much they could have been to change that so once again, score is not lowered.
-Plastic. It is not cheap feeling at all but I would expect it to feel much more premium considering the usual price is $100 but anything more premium would have increased the weight so I am going to let this one slide with the others.
-Significantly heavier than most mice. This is because of the battery but I am not a competitive player so it doesn't affect me. If it is going to slow you down, I did mention earlier that you can pull out the battery and use it wired.
-G11 is hard to reach so I recommend keeping it as profile switch. The button is probably best there because you will need to change profiles if you have one for Chrome and another for photoshop for example. You won't have to open up the logitech gaming software to switch but you can set it to switch profiles when it detects a certain application but it still might be useful if you save profiles directly to the mouse and ever need to use it on another computer. This seems like a con but is actually a pro but I put it under the cons because some people will be affected by that but this one still slides once again keeping the rating the exact same.

Verdict: If you need a gaming mouse that is wireless for mobility to go with your gaming laptop when you are play candy crush at starbucks (BTW, if you are buying this to play candy crush, you need a tablet for that instead. Experience is actually better) it is still the best mouse I have ever used and I would call this thing an MX Master killer but I can't make that call because I have never used an MX master before.

Good Mouse, but with most reviews battery time may vary.
My mouse came with a 1900mah Eneloop battery.

I mostly can play 4 hours of Battlefiled 1 before getting a 25% battery left.
My polling settings are set at 500 instead of 1000, and i am using Game Mode, instead of battery saver mode, or the Extreme mode setting.

I also purchased an Eneloop 2500mah rechargable battery that added about an hour and a half of game time.

With the above settings i consider my use extreme since there is alot of movement and mostly gaming use out of this mouse.
I hope this helps

Mr. J

This mouse is great with a few small caveats here and there. In terms of build quality and feel, this mouse is fantastic. It's become my go-to for CSGO and is a great desk mouse. I really enjoy the profile switcher and ability to remap nearly everything on the mouse.

The issues with this mouse mostly lie in the software. The software feels very strange and buggy, especially compared to the normally brilliant SetPoint software. I originally thought this mouse would integrate with SetPoint, but oddly enough it doesn't, instead it uses its own unique "Logitech Gaming Software" that really isn't very well programmed. The auto-profile switcher often doesn't fire off and leaves me with the wrong mouse bindings in a game when I alt-tab between windows (borderless fullscreen). I also found that the software is MUCH better and a lot more expanded if you set the mouse's profile settings to save to your PC and NOT the mouse, as saving to the mouse is buggy and often won't save/randomly erase your settings. Saving to the PC also allows for backup/restoration of profile settings, and oddly enough, the UI is much better and more responsive if you use "save to PC" mode.

Lastly, battery life on this mouse is.......very meh. It will last for maybe 2-3 hours during a heavy gaming session. Most of the time I just leave it plugged in, but the problem with leaving it plugged in is that the thick microUSB cord often gets stuck on things and makes the mouse a bit more difficult to move. You could in theory swap it out for another, but he included cord is flush with the mouse's microUSB port and stays in better.

Overall, good mouse, but you'll have to deal with buggy software and mediocre battery life (mostly remedied by the ability to wire in).