I don't have a MBP (yet) but I refer to my computers (a Mac Mini and a white MacBook) as "my computer" or "my laptop".
I never subscribed to the whole "if I say my Mac or my MacBook and call my phone my iPhone instead of my phone, people will think I'm really cool, rich and hip and want to be friends with me!!!111onetwothree" ideology.
I've never heard anyone say "my Ford" to refer to their car, and if I did, I'd probably think "wow, how odd", so I try to not to do the same for my computers or mobile phone. 🙂