even though i don't use either of these products (because i have a high voltage system for driving the electric heater) am very interested in nest because it is more modern than your usual thermostat. this thermostat at first glance looks confusing. i have watched a Honeywell setup video in a different WiFi unit and it is TWENTY minutes long! the Honeywell units are very confusing and not at all user friendly. the day-to-day interface is also an issue while Nest is elegant in design Honeywell UI is clunky and looks out of date. this is especially noticeable after the release of "modernized" softwares like iOS 7 and Microsoft Office 2013 which features buttons and objects in without a "border" around it. even though these are only the paint job so to speak but i think that aesthetics like these can really impact our preference and how a device blends into a house. so in a nutshell, i think that if you have a budget of $300 to spend on your HVAC system, the Nest learning thermostat is the way to go. or you can wait a while and see if they release a 3rd generation. i hope this has been helpful.