I deliberated between different smart trainers for far too long and chose the H3 based on reviews and the fact that it's one of the few Trainer Road recommendations. I couldn't be happier with it. Pairing and updating went smoothly. It works great in both ERG and 'regular trainer' mode. It's an order of magnitude quieter than an old rear-wheel trainer, which I'm coming from. It's not a big deal connecting and removing the bike. Two months in, zero complaints.
Has been a great trainer with only a couple instances of frustration which may just be down to connectivity issues. Have had a couple brief instances where the tacx lost a connection when riding on Zwift but reconnecting via the app remedied the issue. One time, after pausing a Zwift ride, the trainer would not reconnect, no matter what I did. Turned everything off, including my wireless router to reboot Zwift/WiFi connection, and nothing worked. Unplugged the tacx overnight and it was back to normal the next day. I've not had that issue again, but I was a little nervous. That was about a month ago, and I've been using this 5/6 days a week since without any other issues, so I'm hoping it was just a hiccup.
Outside of that, the Zwift erg mode communicates well with the tacx and is a great upgrade from a wheel on smart trainer. I've been enjoying it.
I have the first generation of this trainer, the Drivo 1. A friend plugged in a 24v power supply into my Drivo which requires 12v and damaged the control board. Elite support helped me get a replacement board in a very timely manner. This for a trainer that has been out of warranty for 3 years. So if you are looking at a smart trainer you should consider what support will be available after the warranty period. My Drivo is now back online and performing perfectly.
I've owned a couple of other trainers in the past and I was a hesitant to spend so much on the H3, but I'm glad I did. This is by far the closest feel to riding on the road. Riding on the H3 is something I actually look forward to, rather than the painful drudgery of my previous trainers. I especially like the ability to realistically coast on the downhills. The massive flywheel is definitely an advantage, plus It's almost completely silent. Paired with Rouvy, I find myself using the H3 even when it's nice outside.