I have ASUS UL80VT and have had it for over a month, it promised 10 hours, I have used in the office whole
day without charging, that is email, web, coding, jabber, and meetings using WiFi, my guess is I used the
computer for about 6 hours, and 3 hours standing idle/sleeping and there was still some juice left and I got
2 hours at home out of the same charge, that is close enough to 10 hours for me, this was in power saver mode.
I like the switching between the two graphics chips, works like a charm, for most applications there is no
need for the fast one.
I have got about 5 hours of game playing in on battery with the fast graphics on.
My only issue with the machine is that I do not care for the "mouse" buttons, but a USB mouse
solved that problem when lots of clicking is needed.
In short I like this machine a lot and highly recommend it.