It appears to be a solid platform and beats the heck out of using the IR remotes that for some reason still come with these top of the line HVAC units. On a sidenote, that kills me...awesome product, inverter driven compressors, silent operation, highly efficient heat pump and they ship with a IR remote. Not wifi, not even RF...IR, freakin IR! Anyway...
The only gripe I have is the initial startup lag when you launch the app and it needs to contact each individual unit. At times it takes less than a couple seconds for each unit to report back its current status but other times it can take up to 2 minutes. This happens on the home wifi or miles away on 4g cell service. Once its "connected" any command is executed instantly and consistently with positive feedback showing in the app itself which is great. As long as you leave the app running in the background it doesn't need to reconnect and appears to update regularly. If you completely close down the app you may need to wait for it to reconnect to each unit.
I'm not sure if the number of units affect the startup time. In the beginning I had one setup and it was fast. I now have 4 of the wifi modules on a 6 ton system and she's a bit of a slow mover.
I hope someone much smarter than myself is able to put together an interface. It seems all the pieces are there we just need someone to connect the dots.