Moving a freewheeled bike backwards is easy for the distance required for trackstanding.... just pop back off the front tyre, or suspension if you have it, and the bike will easily roll back a few inches. I certainly have no problem with it. It is harder on full sus than on a hardtail though.

greg - I felt that the 5 looked a bit too freeridy for me. I want something around 4"... XC but tough enough for fast trail riding and the drops that entails. Hence why I want the turner... Still, I'm skint now, and the marin rides pretty well so will do for now.