I have 2 Turbo Twist 2's. They are amazing. I have the premium aluminum knobs. I got an energy storage cylinder, but I don't use it. It doesn't feel right to me. If I could change anything, I would like to have a larger diameter knob, at least scaled up 150%. Seems like every spinner in the arcades has had a considerably wider diameter spinner and I think it makes playing games like Breakout, Forgotten Worlds, or Puzz Loop a lot easier to control.