I have the Dbot5 rack and have been relatively happy with it over the last couple seasons. The quick disconnect spline/clamp seems to have quite a bit of wobble, so I torque it down with an allen wrench to make it more stable. I suppose that kind of defeats the purpose of the QD, but I don't want the rack wobbling around.
As you get in to the more delicate boards try to find a spot for the rack that stores the boards as vertically as possible to take the pressure off the board where it meets the rack forks. I actually removed one of my swivel wakeboard racks to make room for the surf rack.
http://i115.photobucket.com/albums/n...r/PICT0010.jpg