I have a Dell XPS 1530.
The laptop itself is very sturdy, very well built and suitable for all I want it for.
The one issue I have with my XPS (and apparently this was the same on all the 1530's) is the battery life.
You can get a couple of hours out of it, but don't expect it to do anything that involves alot of processing power whilst its not plugged in, nor will it last you a train journey from Hong Kong to Shanghai.
I'm hoping they have improved it for the XPS13, if they have.. I would highly recommend it.
I went for the core2duo 2.4gig, 4gig RAM, 8600GT GFX, 320gig HDD. They are very good quality laptops and I do and have recommended them to people who are going to use them plugged in most of the time.