I am using the Honeywell system with the home brew device created [RELEASE] Honeywell Evohome Integration . It seems to work ok though doesn’t control Hot Water. Seems the official version lost traction and I assume has now unfortunately been dropped. Incredible how in so many cases the community can do so much better than the paid developers…
I have not fully exploited the ST version and only really use it to boost/reduce temp. I am sure however it is good.