Instead of the above trade off, I think I'd buy two machines if needed. I see the MBP as a laptop to use plugged in a socket and with a lan cable at home, work

Instead of the above trade off, I think I'd buy two machines if needed. I see the MBP as a laptop to use plugged in a socket and with a lan cable at home, work, a client's place or a library, and only need decent portability and battery life. For all other uses I'd prefer the ipad or the Air(wish I get the $$ for it).