For those of you unfamiliar, NEST (http://www.nest.com/) manufacturers 3rd party thermostats for the home upgrade market.
Owning a SEER 16 HVAC, and a Honeywell basic digital thermostat certainly gets the job done. However I did want the ability to change the time of day that the HVAC operated, as well as have the ability to possibly lower cooling costs in the summer. NEST professes to do this with their trademarked "AIRWAVE",which simply turns off the compressor while running the fan during the last few minutes of your cooling cycle.
Wanting to see how much was gimmick, how easy it is to install, and how useful it actually is I decided to purchase one for myself.
For me, installation was quite simple. The instructions are easy to follow, and each HVAC system is slightly different. However NEST professes that the "2.0" revision supports 95% of all home HVAC installations. It appears that the only complications are multi stage heat pumps, humidifiers AND dehumidifiers, and possibly multi zone systems.
Done! 20 minutes, including WPA-PSK setup on my home wireless network (which is 100+ characters)