My two Mysa In-Floor Thermostats worked well once I got them connected. During my bathroom remodel, the mounting plate and removable faceplate made installation manageable. The error codes also told me what needed attention instead of leaving me with a silent failure.
The app worked better than the pairing
Remote control over Wi-Fi was reliable in my setup. HomeKit pairing took much longer than I expected, even with a network that otherwise worked. I would keep those experiences separate: a working app connection did not make the initial HomeKit setup easy.
The thermostat’s appearance suited the bathrooms. Its touch interface required a firmer press than I wanted, though. That is a small irritation until it becomes the thing you do every morning.
The floor sensor was another practical constraint. I had trouble fitting it under some flooring without creating a bump. That experience belongs to my installation, not every floor type, but I would check the available space before choosing the thermostat.
I gave Mysa four out of five. It handled the heating and remote control I wanted, while setup and physical fit cost more effort than they should. I would rather have a smaller sensor and an easier pairing process than another feature in the app.