I was worried about this one. I've been spurned before. Overall I'm pretty happy with it, though.

I've been PC gaming since middle school, but I broke my right arm when I was in high school. I can use a mouse in my right hand fine for day to day stuff but between the scar tissue and slight nerve pinching that causes it to be uncomfortable, really uncomfortable for gaming. For whatever reason using a keyboard in my right is fine though (I guess because my hand rests on it differently).

I've spent YEARS, actually over a decade, looking for an ideal gamepad. I ended up with a Logitech G13 at some point and have stuck with it but I don't like it for MMO's, basically not enough buttons combined with having to program different profiles for each game was rough. I picked up something really similar to this device a couple years ago but it was angled a bit differently and used Cherry MX Black switches and it actually physically hurt my arm after brief play sessions (20-30 minutes). Hence why I was worried about this.

After pulling all the keycaps off and spinning them 90 degrees so I can use it vertically instead of horizontally and programming it... it's taking a bit of getting used to a slightly altered button layout but I'm getting there. It's not as comfortable as my Logitech G13 but I figured it wouldn't be, but it's WAY more comfortable than the similar product I tried a couple years ago.

The software's easy enough to use, although I'd love a toggle to switch from horizontal to vertical (not necessary, just a nice option for those of us doing that), and once I got it setup I haven't had to run it again.

I could see this being a great macro keyboard for work use, but for me it's a "better than good enough but not perfect" gaming pad. I'm still tempted to start researching custom building my own so it could be more ergonomic but for now this will work.

Update (08/05/2018):

Figured I'd do a "I've had this almost a year now" update. It's still a solid 4 stars. Still vaguely interested in custom building something more ergonomic but haven't felt the need to since I got used to this. Not perfectly comfortable for my needs but I'm used to it and it's working just fine. Now the biggest complaint I have is that the manufacturer still hasn't listed this on their actual website and from I can tell the only response to "where can I download the programming software" is "the URL is on the manual." Neither is a huge deal, but I tossed the manual a while back and I'm curious if the software's been updated at all and can't track down any website to download it.

Update 10/18/2020:

I bought another one. Old one's mostly fine, keycaps are dirty but I could clean them if i cared enough. I was able to put my old one back into "programming mode" to copy the keymapping to a file, then load that file onto the new one, and I didn't realize how nice that would be.

They did change the model a bit. The shell feels cheaper, it's lighter, the USB cable ports don't come with covers, the gold/bronze colored screw caps on the top now are just formed bits of plastic in the shell... It's fine, but definitely doesn't feel or look as premium even though it costs the same. It did come with a pretty basic set of black and white key labels you can use and a keycap remover (which I don't think was included last time). These labels are just the main keys, no F1-F12 row or other such "uncommon" keys. A-Z, 1 to 0, and some punctuation keys. I don't think the cost of these add-ins outweighs the cost reduction of the cheaper materials/build quality. Again, it's fine, but for how much it costs I could get a similar quality 104+ full size keyboard. Granted, they probably have a special PCB, and a different kind of chipset so it's fully programmable, but those kinds of thing shouldn't fluctuate the cost so severely.

Another change is that the older model is flat, no angle, but this model has a very slight angle to the body. If used as pictured it's like a normal keyboard slant, but used vertical by my right hand like I do it leans the right up into my hand... which is kind of fine? It's a weak enough angle that it's not super noticeable and it probably helps shorten the distance my pinkie finger is reaching, so I guess that's fine.

Still a solid 4 stars from me, but the obvious cost reductions done without reducing the price are tempting me to drop the score. There's nothing else quite like it for my needs, at least not without spending WAY more, so I'm just happy someone's making stuff like this.

I'm a left handed mouse user, and that creates all sorts of issues trying to use my right hand on the keyboard. I've been using the Logitech G13 for at least a decade now, but Logitech discontinued it years ago. The G13 is the only (mostly) ambidextrous and programmable keypad I have been able to find. Everything else caters too heavily toward operation with the left hand.

This fully programmable pad is the closest I have come to something I can use with my right hand. The only complaint is that it's layout mimics the left side of the keyboard. I didn't realize this when I purchased it (it is shown in the pictures). I wanted something completely symmetrical so that I could use left or right hand without any sort of bias in the key layout. The discrepancy isn't BAD. The important part is that I can remap everything and replace the mechanical key caps with whatever I like. It's just not the dream solution I was hoping for.

Also, there's no wrist rest or anything, so you'll probably want to buy a 3rd party solution if you use it for any significant period of time...like any keyboard.

The key mapping software is...um...low tech, but it's manageable. It's nothing as malleable as the Logitech or other gaming software platforms. But it's manageable.

All in all, this is a very usable product. You get half a keyboard of fully programmable and replaceable mechanical keys to bind as you will.

I'm so glad I found this. I needed a keypad to go with my laptop but I wanted I few extra keys I could use to fire off some AutoHotKey macros. This worked perfectly.

The smkd72 application worked great for programming the keyboard. Keys can be programmed in the following modes:
* Normal Keyboard
* 3-Layer Keymap
* Mouse Function
* Hotkey Function
* Burst Function
* Round-Robin Function
* Continue Function
* Jitter Function
* Profile/Macro/Backlights
* Disable Key

There seemed to be a few features that are designed for gamers but I can't really comment on those. And some features for other Koolertron keyboard models eg backlights. I only used the Normal Keyboard and Hotkey Function modes. The ability to use HID codes directly meant that using F13-F24 and SHIFT+F13-F24 was a straight forward way to trigger some macros.

The keyboard presents itself as well made. I actually have replaced all the key caps with some DSA profile keys I had recently acquired for that purpose. Once I'm happy with my layout I intend to get some relegendable keycaps between ESC and BackSpace, 4xMedia and Cut/Copy/Paste/Swap keys.

Current functionality other than the obvious (all using AHK):
top row - window always on top toggle, reload AHK script (other 4 unassigned)
2nd row - vol-, vol+, play/pause, next
3rd row - highlighted word search of google, youtube, wikipedia, dictionary.com
ALT+ above - google image search, search with " trailer" added to the end, random wiki page, thesaurus.com
4th row - cut, copy, paste, swap highlighted word with clipboard
ALT+ above - same functionality but using a secondary clipboard

I use it on the left of the keyboard.

Update 7th march 2023:
I got some custom keys from pimpmykeyboard.com so I've added a new photo. I use it on the right of the keyboard now.

Very expensive for the experience.

The overall build quality is low, but the functionality is perfect for my use. using it for custom macros inside games. And for that use, it is wonderful. The rotary knob has been wonderful for other functions that you want to have a variable delay on.
My main complaint is merely that the usb c socket is set kinda deep making it not work with the majority of cables I have, my solution was a cheap slim extension cable.