Funny, I was researching this over the weekend.  I haven't really seen anything negative, just not sure I can justify a $250 cost for a thermostat.

I live in a house that has one. It's a fun gadget, especially for a tech geek. The interface is really well-done, it's Internet-accessible, it has a motion sensor to sense when you're not at home.

Basically it works well, it has great design, and it will probably save you some money. I'm not sure if it's worth it to people to whom $250 is a serious amount of money, but if it's not a serious amount, then by all means get it. You won't regret it.

boo... think you may have just cost me some money.... as I explain to my wife the cost savings...

Kevin Rose installed one at his Mother's place so it must be good.  

k - so I'm taking the plunge.  I'll be happy to answer questions.  You can check if your wiring is compatible here (odds are it is)...

http://store.nest.com/#compatibility

Other stuff - the shipping requires delivery confirmation.  A little annoying, but just a heads up.  I choose next day delivery - options where ground ($10), 2nd day ($15), and next day ($20).  It says it can take up to 2 business days to process.

Anyway, I'll have it before too long.  Will post on experiences, etc.   Feel free to ask questions in 3-4 days.

• Nest Learning Thermostat
• Quantity: 1

• Price: $249.00

• Taxes: $0.00

• Shipping: $19.99

• Grand total: $268.99 USD

K - I've got it and installed it.  1st - a few things I learned that I would have done differently.  Buy it on amazon.  It would have been free shipping (free 2 day if you have prime).  Could have saved some $$ that way.  Didn't know it was for sale there until after I ordered.

Anyway, install was a breeze.  Be sure to take a picture of your wiring before you remove the old thermostat in case there is any confusion about wiring.  Anyway, I had the old one removed and the new one installed in about 20 minutes.  Nest comes with all the screws, mounting plates, and even a nice little screw driver that did the job quite well.

Setup was also a breeze.  It boots up for the 1st time and then runs through its setup.  It auto scans for your wifi network, you put your password in, and it immediately updates itself.  Once that is done, you continue setup.  It's all pretty slick. 

So, now its monitoring my patterns for when I turn the air or heat up or down.  I've also added a few baseline things like to turn the ac off when I leave for work until it reaches X degrees and to then bring it back down to X degrees when I get home.  We'll see how that goes tomorrow.

The web and iphone interface/app work great.  What you see in the browser version is pretty much identical to what you see in the app.  So, decent info is avaiable.  As it finishes doing some baseline stuff, it gives you a pop up on the Nest itself.  For instance, I just noticed a pop up indicating that airwave is now enabled (their tech for turning off the air for a bit and just running the fan to circulate to the cold air (eg cost savings concept). 

Anyway, that's all I have to say for now.  If you have any questions, ask away; otherwise, I'll post in a few days with any additional feedback.  So far, I like it. 

Apparently works in dual-thermostat homes but that means $500.  I like the concept but might take awhile to recoup the investment.  Be interesting to hear what the impact on your utility bill is, pacov.  I'll keep monitoring for your feedback.  Thanks for trailblazing.