the cup seems to heat good but the lid is gonna take some time to get used to it has a raised edge that you drink from doesn't seem to hold enough coffee but i like it not to crazy about the way the power plug is sticking out of the side of the cup i would think it would bust easily it looks like a speaker connection on the back of a stereo and sticks out of the side about a 1/2 inch only used it for a couple of days so we'll see what happens also the lid does not fit tight and will come off easily

I have used this cup for a couple of months now, several times a week. It does what it says it will do: reheat my coffee in a reasonable amount of time. This display tells you the temperature of the liquid and also lets you set the max temp. I wish it didn't go as high as it does since it can heat to dangerous burn levels. I set it to about 125F and that works pretty well for me. A barely warm 12 ounce cup of coffee only takes about 2 minutes to heat up. It doesn't sit well in the cup holder of either of our cars but I don't see how one could change the design to fix that- the electrical connection is going to stick out anyway you look at it and give you problems. I put a neoprene sleeve in the cup holder to help hold it more securely and also put some folded up paper towels in the bottom to give it a boost so the plug will clear the edge of the cup holder. Works fine like that. People have complained that the device stopped working in the weeks after they got it but I wonder how many of those were blown fuses. The power cord has a fuse in it (they even give you a replacement fuse) and it blew in my unit after about 3 weeks. Looking at the design I think I know why. I kept the power cord plugged in all the time while driving, even if I wasn't heating anything up. This means that the "hot" part of the power cord, the part that plugs into the socket on the mug, is always exposed and could short out against any bit of metal it comes in contact with. Now I unplug it as soon as the coffee is hot. The fuse hasn't blown in the month since I starting doing that. That is a bad design decision- they should have the plug on the mug and the socket on the cord and that would solve that problem. Time will tell if I am correct in that assessment. The only other complaint I have is with the design of the cap around the drink opening. It is raised a bit and thus when you take a sip some coffee always remains on the lid, it doesn't drain back into the mug. A small thing but annoying nonetheless. Overall, I would recommend this product if you use it carefully and work out your own solution to keeping it secure in your cup holder.

UPDATE: I have to take away a couple of stars because of what has happened the past few weeks. A couple of weeks ago the LCD stopped working. I can do without it because I know that it defaults to 120 and five clicks will set it to 125F but it is disturbing that it failed so soon. This week the power socket came loose. Can't see any way to tighten it. I have been very careful with this thing, never dropped it, try hard not to get the outer parts wet, yet it is falling apart after a few months use. Too bad, I really wanted to like this thing, but will not buy another without assurances from the manufacturer that the design has been improved. It is too expensive to only last a few months.

I ordered two of these for over the road truck driving. And at first they worked very well. But then on the second time using the first cup the power plug on the side of the cup fell off and or broke off. On the second cup on the second use the power plug that goes into the vehicle melted and no longer works. I would return these but just got back to my home base from traveling.
These cups will keep your beverage hot that's for sure and the lid is a nice tight fit. But they need to fix the power issues on these cups then they will have a great product.

I just bought this product today and it worked for about five minutes and then wouldn't stop beeping. I unplugged it, left it unplugged awhile. Beeping continued. Emptied it thinking it was too hot. Put luke warm water....still beeped. Tried cold water and it still beeped. I am so highly disappointed. I tried to do an internet search to see what I was doing wrong and found no answers. I am so highly upset!!!

I like it that it shows the temperature so that I know when it is ready to drink without constantly sipping to test, which was very annoying with the heating rod I used before this one. So far it does the job fine.
I thought it was ok to have tapered shape like some big soda mugs, but turns out the lower part is much slimmer than a typical car cup holder, and it won't sit snug in a holder. Can be improved.
The stupid part is that the power plug is sticking straight outwards where it'd better have an elbow so that the cord would go up along the wall of the cup holder. I'm afraid the cord might break at that point over time, so I'm very careful with that. We'll see about it.