Well I don't want to hijack either, but I'm very guilty of that, very often. One really long (somewhat rambling) reply and we can take it to a PM or just start an Ember thread if you want to know more.
There's no Hubitat integration for Ember, but there is one on HA and there's HADB, so it counts. 
There's a lot of versions of the Ember out there. I own the original Ember Travel Mug, which I got becuase I like the idea of a lid to improve battery run time and prevent spills, and I like an easy to transport mug for the car, especially one that will stay just the right temp.
Many Ember users love their mugs (overwhelmingly positive reviews) and I totally get it now that I have one. What the biggest complaint is about, has to do with battery longevity. I have the skills to rebuild the battery for my Travel mug. That point is key to my choice of which Ember mug to buy. Most of the new mugs (possibly all of them now) cannot have their battery changed. So when it won't charge any more, you have to throw away the mug. That sucks for consumers since they're not cheap and it sucks for the planet in terms of e-waste.
The second most complained about aspect are the pogo pins in the charge base sticking down, but that's avoidable and somewhat user repairable.
The original 10 oz Ember mug can take an aftermarket battery. You just twist the base off and do a little disassembly to change the battery with a new one.
The original Ember Travel mug (the one with the rotating base to adjust the temp) can also be disassembled. The caveat is that there is no replacement battery pack available. Even when the Ember Travel mug v1 was still in production (the newer Ember Travel mug 2 and 2+ use a different battery type), Ember refused to sell replacement battery packs to anyone. So if you're like me, you can follow the steps in the video linked above and rebuild the battery with replacement cells from Aliexpress. It's a bit of work, since it's raw (unprotected) cells needed for the job, and they are only available with integrated protection that has to first be removed from each cell before reassembly. But I chatted with a Reddit user that said he did it and gave me some pointers. I'm in the process, but accidentally broke one of the tabs off a new cell. So I've had to order more from China before I can proceed. Another month wait and I should be in business.
OK, that first tangent aside, I absolutely love the mug. I can enjoy my coffee and I never make a face when I find out it's cold like I did with regular mugs, never burn myself becuse it's too hot like can happen with thermos types (Ember has a small amount of insulation. It's dependant on the battery or the charging base to maintain temp), and I can set it to eactly where I want my coffee temp to be. For me that perfect temp is 130˚F. If you like your coffee really hot (beyone 145˚F), then Ember is not for you. Also, I'm going to assume that people liking their coffee that hot, are also not going to get the same battery run time. Many reviewers suggest that point.
Currently I get around 45 min on battery and then it's dead, but most of the time it's on the base right next to me so it can last for as long as I need it to. I drink my coffee with milk, so if I don't get it hot enough before pouring it in the mug and it needs to heat it up several degrees, then the mug can sometimes suddenly show the battery as empty, even though it isn't. Probably cannot handle the full load on the battery required, and if I turn it off and back on, the battery doesn't show empty and it continues (sometimes). My mug was used. I'm not expecting new performance. I was expecting to do this battery rebuild from the start. I paid $56 USD ($100 CAD by the time it got to me) on Amazon.com for the Ember Travel mug version 1, and the replacement batteries were around $42 USD (Shipping to US varies based on state + Orange man tax). Of course, I would order an extra just in case you make a mistake. A lesson that I didn't learn until I had to pay shipping twice.
So if you are not into the battery change or rebuild idea, then I would say Ember (whichever type you prefer) is very much worth it if you're OK with the high price for brand new, and the limited lifespan. I don't think I would be as happy with an Ember non-travel mug type. I like the display info on the mug (i.e. Rough battery level and exact temp of the coffee). It will likely cost you more than origially planned if you go for the car charger too (which is very specific to Ember and trying to build my own didn't work out). I also bought the sip lid for the travel mug and I bought an extra charge base to have in another part of the house (but got that for a used price and Amazon sent me a brand new one).
There's little use for the app in my opinion and I'm not alone in that. The app shows exact battery percentage and allows firmware updates if they're needed. Other than that, it's not really needed with the Ember Travel mug. Everything you really need to know is displayed on the mug. All the other Ember mugs rely on a color led and the app when you need more information. That might be where the HA integration is more interesting to some, but for me it's just not needed. I played with it, but I don't use ESP Home, so Bluetooth range is limited.
In regard to other brands of temperature controlled coffee mugs, I've no personal experience but the many reviews I looked at all said that nobody is able to control the temerature as precicely as Ember. It's a pretty sophisticated design and there are three different controller boards in the mug. Heating is also very gental, yet fast enough for a minor reheat if needed (if you don't pick up the mug from the charger base for a few hours, it will auto shut-off).