I have the 17" MacBook Pro 2.33,2gb,X1600 256mb,160GB HDD.
I would say it is much better than a PC laptop in all areas!
My Step dad who im visiting at the moment has a Dell XPS laptop, my MBP is about half as thin as his. If you opened up the screen on the XPS and just had the base bit, my MBP shut is still thinner than it.
Much better build quality and very lightweight for what it is! Doesnt get too hot either so no annoying fan on the whole time!
Get one! There the best laptops ive ever been on!
Josh