I looked at that one and almost bought it… I actually like the Honeywell so far as a thermostat. My issue was many of these new “smart” thermostat are not actually good thermostats, more technology than the basics of hvac… I had a Centralite and a Nest before, and they both had ± 3 degree variances, which is unacceptable, the Honeywell is at least a thermostat first with technology second… It keeps my temperature correct and within 1 degree of what I set it at.
But, I have not tried the ecobee3…
My main comment was the integration works, the data comes through, SmartThings support a UI template, it’s on their own example development pages, on how to build a thermostat with the thermostat control with build in up/down arrows, display for humdity, etc… I’m just surprised they don’t even use their own control for a device the say they directly support on their website.
If I could get access to the device handler code I feel I could clean it up in a few hours and give it back to them, just UI work, I’m sure the SmartApp they install is great for communication to the Honeywell cloud, don’t need to change that, it’s working, just want to update the tiles to look like I know they can from other thermostat device handlers I have built myself.