New convert here - recently got a 13 inch MBP and put my intel X25 in it - nice! Anyway - I look at the bottom the other day and is has some scratches towards the back - I know it will eventually get them but it is less that a week old and I have tried to be very careful with it. Anyway I carry the machine in my briefcase in a pocket designed for a laptop but was considering getting one of those "shell" type cases. I have seen both the incase version and the spec version of the "shell" type case - can anyone recommend one or the other? Also - how are these cases with heat and do they add much bulk?