I saw one of these in person the other day and they look amazing, the screen is very impressive considering its size. It all looks well put together, I still sit on my opinion that apart from the very top range, the other sony laptops have 'not so good' build quality. The laptops that compared to my IBM T43 seemed to miss a feature or was lacking in performance (considering unless you get a discount of some sort IBM laptops are horrendously expensive, but i wouldnt say overpriced). I have yet to find another brand of laptop where you can push the screen from the back and see the effects on the screen.
But I found i dont use my T43 as much as i thought I would and wish I bought an X41, the sony you're getting definitely is in the shortlist, give us a good review when you get it