Overall, I love it. I've only been working from home at my desk for a few months, but i knew sitting still everyday was awful. It's just fun to be able to move your legs around and fidget while working.
It keeps you from feeling still and helps me to take breaks less often, since I don't need to get up and 'shake it out' anymore.
I got the desk mounted Hovr in an attempt to save space under my desk. However, now I kind of wish I got the Hovr with stand. My desk is pretty sturdy overall, but many motions shake my entire desk. So you need a super stable desk that won't move at all.
I also had to bring a rug into my office as my office chair kept rolling as I attempted any motion. It comes with a wheel stopper, but either I'm stupid or you have to spend 1-2 minutes every time you sit down in order to line up your chair with the wheel stopper. But the rug works fine.
The first day was super awkward, as you need to position your feet just right for comfortable use, which can take anywhere from 5 seconds to a minute. But once you get used to it, it's a lot easier.
So overall, I love it and would recommend it to anyone that sits at a desk for an hour or more per day. Just note that for me, the first 2 days were quite frustrating and awkward, but now it feels great! And I would pass on the desk mount unless your desk is super stable.