Replying to Dell Inspiron 6000 laptop

hey guys im looking tinto getting this laptop and i have a couple concerns, first of all how heavy do u find it? its like 7 pounds and i really want to be travelling with it but not very often so yea can you use it on your lap, or is it uncomfortable? also how is the batterylife with the standard battery? I am either gonna get this laptop or the dell 700m but im kinda leaning towards this one cause of sonoma and better graphics the only thing that im worried about is the weight, well thanks guys, cheers