Im going to be starting college in the fall and I'm looking to buy a Mac. I have my eye on the rMBP (base with 16gb ram), the only reason I'm hesitating is the size of it. 15.4 inches is quite large and 4.46 pounds isn't very light. Do you think it will be a problem, keep in mind I will have to walk probably 10-15 minutes between classes and probably have 2-3 classes a day. My alternative option is a 13inch MBA (base with 8gb ram), but I'm really leaning towards the rMBP.