I've currently got a 2008 unibody 2:53 MBP and am seriously considering selling it to get the smaller 13 inch machine. Easier portability and tons better battery are the reasons for my considering the downgrade. Playing with the machines in my nearby Apple store, I'm getting the impression that the 13 inch machines are running much hotter than their 15 inch counterparts. Is this the case? Also, how usable are apps like Final Cut Pro and Photoshop on the smaller 13 inch screen? 15 inches barely seems like enough for these kinds of programs.