Should I buy the Nest? Only if you think your current thermostat is ugly, or you have a $250 desire to change the temp from your iPhone. I like the Nest, but I mostly like it for its looks and the hope that one day it will be really awesome.
Good review from Brooks. He has good things to say overall, but talks a lot about improvements that need to be made to make it as smart as advertised. I have contemplated buying one of these, but the reviews have been very mixed. The good news is that the software updates come via WiFi, so The Nest could be a lot better without having to buy a new unit.