We are pleased with the honeywell thermostat. I found the instructions to sync with my samsung phone difficult to navigate, however the online chat was very helpful in guiding me to the set up process.
Your purchasing options are not fleshed out enough. I bought my Honeywell thermostat from the Heating company I work with - they'd just installed a new furnace and my main request of the thermostat was that I be able to access it via wifi.
I really like the Honeywell system. The only problem that i see is that it goes offline at times. Everything else i have on wifi stays on. Other than that, great system.