I used a 15" PowerBook for years, finally moved up to intel a few months ago with a new (to me) 13" unibody white MacBook. I found that my eyes could not get used to a smaller screen, even if it had better resolution than my old PowerBook. Couple days ago I got a great deal on a 2010 15" MacBook Pro and I haven't been this happy since the day I got my PowerBook.