I installed my Ecobee3 earlier this week. I really like it. I think it’s superior to the Nest, especially its display. It has a couple of quirks - things like non-intuitive messages in the display when the “At Home” detection override kicks in (I originally thought I had accidentally set something wrong myself, or the thermostat was setting things on its own). I also struggled a bit with my installation because it took me a while to find how to change the Reverse Valve action to get cool air when the A/C turns on (I have a heat pump). That isn’t clearly documented anywhere - I eventually found it through trial and error after about an hour of frustration. Otherwise, it’s running and works very well, not to mention looks very good. Glad to have that dated looking (albeit very functional) Trane thermostat off the wall.
I will also add that I submitted about four support requests this week for random things, including the aforementioned quirkiness with the “At Home” override, and responses from Ecobee were very prompt on every one - no more than 24 hours, in a couple cases within just a few hours. The Web interface is very easy to use to set schedules and change settings, and the iPhone app is also very well designed and functional - completely mimics the touch-screen interface of the thermostat itself (minus some of the detailed configuration settings, which you can only change on the thermostat).
The standard package ships with the thermostat and one remote sensor, which is sufficient for my primary home. There’s another bundle that ships with the thermostat and three sensors (currently at a small discount), so I decided to buy that one for my weekend home and will install it there next weekend. They include a power extender module in the package at no charge (although I didn’t need it) if you don’t have a common wire running to your thermostat.
I eagerly look forward to when I can control it through Vera.
PS: I ordered both directly from Ecobee. Orders were shipped within one day via 2-day Express (free).