Yeah, was not suggesting a mac at all and was going by some of the suggestions we use at EIU for students who want a laptop for use in the classroom as opposed to as a desktop replacement at home. We suggest a real world battery lifetime of 4-5 hours because although we have places to plug-in all over campus, in most lecture classrooms you really have to use the laptop on battery. So if you have 2 or 3 classes in a row, the 4-5 hours is a minimum with some reasonable reserve. As far as size we also recommend 15" as a maximum size because most classroom desks are not huge and people get pissed when you open up your 17" behemoth and push them over to the side.