Look fine, and smooth enough once started, but feels too heavy - but I feel the same running Vista on my AMD64x2 4400+/2gig/GF7600. I chose the standard battery pack for the lenovos (higher cell-count ones are available), last around an hour and a half doing real work.
I am running Vista Business on AMD64X2 4600 and one GS 7300 and 2GB memory - identical to fOdder's machine. This machine has a 10,000 Raptor Hard Drive and is the SMOOTHEST, most comfortable OS I have ever used for browsing. Everything serious gets done on my XP Pro.
As was mentioned earlier, the SPEED of Hard drives is something that never occurred to me. For a battery powered laptop it would seem extremely important as long as there were not significant power requirements.