So much talk about wanting the 15 inch model.
It is nice but I bought an XPS 15 and for school it was great but now... wish I had a 13 for more portability. The 15 is just over that line of too big and bulky IMO.
Dunno, I use mine (9550) for uni and I think it's small enough, fits perfectly on those atrociously small foldout tables in the lecture halls.
Only problem I have with it is that I dropped it once (or rather, I dropped myself, tripped over a low fence at decent speed, fell on my face, had just enough time to think 'glad my laptop is safely in my backpack' before my backpack flew over my head and into the pavement.)
The one screw post holding the case together in the top right corner around the hinge broke off, and the hinge has by now worked itself loose. Gotta replace the entire fibre-resin part and am having trouble finding replacement parts that don't have the exact same defect.