In a market crowded with Ultrabooks, it's the little things that set competitors apart and can make or break one over another. Apple's MacBook Air is known for long battery life. One Dell model has a screen that flips horizontally. Samsung and Lenovo offer detachable keyboards. What's special about the EliteBook Revolve 810 G1 from HP? Quite a few things, actually, and one of them isn't the way its screen flips around. Here are six things that set HP's latest laptop/tablet apart (it's technically not an Ultrabook), and at least three that make it just like so many others.