It arrived today, assembled and tested with my gn , went on easily forwards and backwards, seems ok, it will need slight adjustment with the height of the front chock and I had to pack out the square hole where the box section adjuster drops in with a couple of big washers as it was a little slack, but otherwise, for £30 i am well pleased. Just need to try it with other bikes when i get a chance.. just tried with a 17" (skinny tyre) wheel bike, it works but had to move the pin back a bit,