I was wanting to get some opinions from owners of the MBP 15" and 17" models. For portability, do you find the 17" to be too much? Is it too big to carry around class/work? If anyone has experience with both, can you compare daily mobile usage between the 15" and 17" models? I recently sold my 17" laptop (gaming laptop) because I found that it was cumbersome and backpack choices were very slim. I understand that the MBP 17 is the smallest 17 you will find. I still have my doubts in portability though. I have gone up to local stores and experienced both models. Unfortunately they won't let me put the macbooks in my backpack so I can walk around and feel how heavy and cumbersome they are when I am on my motorcycle. My main priority is mobility. I don't need a desktop replacement.