I have a 17" XPS and it's great as a computer for that floor of the house. Ie: for sitting at the kitchen table or the couch. I have a 13" for portability which is great because it's so small and light.

MacBook pros these days are really heavy. Having a MBP and an Air is actually a fair inventory but the MBP is just so expensive.

I do like the desktop form factor of keyboard and monitor but the 17"er is nice to use while I'm up making coffee in the morning or while sitting on the couch at night