I had a 3m Pro II last year which was lovely to fly and got me going well with a board. No problems encountered with luffing at the edge of the window. Problem I did have with it is I had to send it back to the Mft'r after 6 months of flying as one bridle line attachment point along had completely snapped and at aleast another 6 were fraying badly and ready to go at any time! I did not go for another Rad but went for a more robust Crossfire. Don't know if they've sorted the problem out on the Pro III?
