Who has them, who likes them, and which are the best ones to get? I'm very, very, very tempted to get the 6-pack light-up ones. But how long do they last? If you turn them on, how long do they stay lit? Can you guy's post some pictures of your energon cubes please? Yea, I know I could probably make a 2 cent pink-paper energon cube, but frankly that look's cheesy. Want something worthy of my collection.