15" macbook pro, bought yesterday.
Discharged the battery full once, then charged it back up.
Time: 3:30.
73 watt hour, on the 9400m.
Full screen brightness.
Surfing the web, reading some pdfs, not downloading anything or playing music, fan is dead silent, did some skype for about 45 minutes. Watched 3 min of terminator salvation hd trailer.
By comparison:
Dell Latitude E6500 (macbook pro led panel, matte, comparable panel)
windows 7
56 watt hour battery, intel 4500hd integrated graphics
Same conditions (full brightness, surfing, reading forums, a little chatting)
Unlike the mac os, I actually could use power saver mode and disable cd drives, etc...
4 hrs
I was hoping for better from this battery. It may well improve, however, so the jury is out. But it's not magical. It's absolutely better than the last generation and the gen before that simply b/c it's bigger. I was curious at the diff b/w operating systems, and in all my tests I have never found that macs yield amazing battery life at all. Perhaps undervolting will give me some more juice. I call bachelor of science (bs) on 7 hours of battery life. You have to increase the screen brightness on these glare screens or you'll go nuts.