Today I installed two ecobee thermostats for a customer in Northern Virginia. Althought there are a few similarities with the Honeywell wireless product, the Ecobee is a completely different device in other respects.
The Ecobee connects with your wireless network, and communicates with the internet and the Ecobee site for remote access- yes, there’s an annual subscription fee but the benefits are pretty cool.
I started by mounting the device to the ductwork near the furnace
then wired it up to the rest of the system. One weakness of the product that it uses its own power supply, which means you need an extra outlet near the furnace. I’d like to see a future device “steal” its power from the system it runs. I guess having a separate power supply means that the ecobee still runs when the system crashes, but an internal battery could do the same thing.