I used to have an ugly one that worked ok, Then I got a simple black one to make my desk look a bit more slick and simple. But that one was glitchy and NEVER kept/made liquids hot. Different heat temps and timers made things more complicated. But THIS NEW one is fabulous--the best EVER. Just plug it in and it goes on when there's a cup on it. And it keeps the coffee/tea or bone broth nice and hot. Glad I got this instead of all the silly feature-laden stuff that really doesn't work.

TLDR short review:
WARNING: Plate. Get's. Hot. That part is obvious, yes, but please - If you have a pet/child/anything be very careful. There is no indication for when the plate itself is hot (like when you take your mug off and it's cooling down) and the plate is almost oven-burner hot. I had it on for maybe 2 minutes and wanted to see how hot it was so I touched it (I know, save your judgement) and woooooboy. We all know it's hot, but understand it get's hot FAST and will probably take a long time to cool down. I imagine this is common amongst all mug warmers, but just be cautious. With how large this plate is I'm afraid my cat will accidently step on it when walking when my mug isn't on it and burn herself.
Pro:
It keeps my mug at a manageable heat. I think it's more warm than it is hot, frankly, but it's much better than the alternative of just a regular coaster. It's also cheaper (half the price for some units) and I mean, it's not awful. Don't expect fresh out of the pot/Keurig hot, but it's decent. (my mug is also thicker so that could potentially be it)
Con:
1) Cable is short. About 3 ft. I was able to make it work but I would've preferred a longer cable, like 5-6 feet, or even 4 feet. It was just barely too short for me. Yes, I can use an extension cable or a surge protector, but I wanted a slightly cleaner look because I already have a TON of cables.

2) It has a burning smell. At first, I thought it was my heater, so I turned it off. When it didn't go away I realized it was my device. It's been on for a few hours now, maybe 3-4, and it started out okay with no smells/issues (plate gets REALLY HOT REALLY FAST by the way. Maybe not necessarily your cup given the thickness of your mug, but the plate itself is h o t). Because it's my first time using it, I'll give it the benefit of the doubt and continue to use it for a few more days to see if the burning smell is just "normal" for the first few hours of use. I won't leave it unattended near thousands of dollars of gear, though. I don't think I trust it that much.

3) I would never leave this on in/around your devices. Given the burning smell and some of the reviews (of it literally burning/catching on fire) I highly suggest that when you use this product you don't walk away for longer periods of time. I would use this as a "I'm sitting here and drink my coffee slow because I'm busy working" product and not a "I need to do the dishes, let me walk away for 30 minutes" product. Either take it with you or finish your cup. ESPECIALLY if you have pets/children and have an expensive set-up. This is not like a normal electronic and puts out a significant amount of heat. Be careful.

It works pretty well, I'm using a thick mug with a sort of a con-cave bottom that's really small so frankly, I didn't expect it to keep it super hot, or as hot as it was when it came out of the Keurig, but it's not bad. The temperature I relate to nuking it in a Microwave for like 20 seconds or so. It's not HOT but it's not cold/warm necessarily, it's at a good, consumable temperature to where you won't burn yourself. It's almost as if you've made a fresh cup and it's been sitting for 10 or so minutes un-touched. It's hard to really explain the temperature but it's good. I'd compare it to the child-temperature system that Starbucks uses for their hot, fresh drinks.

I like it. It's larger than I thought it would be (good thing) but the cord is actually really short. This is going on my gaming setup and a short cord means I'll have to bring a power-strip closer (it's just barely too short to my Cable management box by maybe 6 inches, such a bummer), but I can get around that no problem. Annoying but manageable.

I will glance at other products in case the burning smell doesn't go away or I get way too paranoid to leave it near my setup even when I'm sitting here (because I do forget things) but overall, it's not awful. if I wasn't afraid of it burning down my house/setup or damaging anything, I'd give it more stars, but that fear knocked off 1 star, and the warmth is decent but could be better.

I purchased as a gift and wife loves it she will come out and warm her coffee many times that has ended, I purchased a second for her to take to work.

I bought this for my wife and she absolutely loves it. It really works. Most things like this come with its own mug but you can use almost any coffee mug. Really impressed

I like having a warmer and not having to run to the microwave to reheat. I find it a bit disturbing that the warmer will keep coffee hot till the last drop and other times it doesn't, my last warmer did the same.