I just made my first purchase thanks to all the great input from you guys on the forum and from Darcy. (Customer service with this company is outrageous!)
I got an Ego with a horizontal brain cell for my "classic" 15.4" Macbook Pro. I am hopeful I chose wisely and didn't need to go to the SuperEgo.
In any event, should I ever decide to get a backpack as well, will the horizontal cell be fine, or will I need to spring for a vertical?