They point out that it barely squeaks into the ultraportable category (four pounds and under) by using the 4-cell battery. You’ll definitely want the 6-cell or better yet, the 9-cell.
PC Magazine gave the M1330 their ‘Editor’s Choice’ award in the ultraportable category, and a score of 4.5 out of 5, saying:
The M1330 takes all the wonderful things from other ultraportables to create an ideal traveling companion.
It’s been a while since Dell delivered a laptop that possessed so many awe-inspiring features. The Dell XPS M1330 is a monumental step in that it takes the best things from other great ultraportables and combines them into a single entity. My only peeve is that the weight can get up there with the nine-cell battery. Otherwise, this ultraportable should easily sit at the top of any laptop shopping list.