Couldn't agree more about the chair backs, especially if people around you have them. They aren't nearly as comfortable as a real stadium chair back would be, however they guarantee your space is YOUR space.
Unless you have an overactive bladder, I've always found that being on the end is a pain. Sure, it's great when you need to use the restroom, but only during times when the game is happening. If you're trying to get to the concourse during high traffic times, like right before the half or after a close game... you'll be stuck just like everyone else. Also if you don't choose to leave your seat at the half, the half is marred with getting up and down or getting kneed in the back by everyone else who leaves to do their business. I'm up against the railing that splits EHU in half, five rows from the top. Love it up there.