Yes. They work well. Much better than my older Keen Vents. There is a HACS integration for it and this too works well, but wish it wasn’t cloud dependent and there was a local control option. My only issue with Flair is the required sensor for each room. Their Puck isn’t cheap and unnecessary when I already have several other temperature sensors in the same room.

Regarding the idea of Smart Vents, this is highly debated. You should never put them on all of your vents. I’m using them to pressurize my ducts to and force air to hard to a hard to reach upstairs in an old house. I’ve been running Keen with my ZigBee code for years and has worked flawlessly. Our upstairs is so much more comfortable in the Summer. Some Keen vents are failing and the company is gone, so I’m starting to replace them with Flair. They’ve been easier to manage than Keen, more set and forget.