Been riding the Vanguard (5'6") for a few weeks now and really liking it, I do have some northshore inc stick on screw mounts for a front foot strap but I have just been riding strapless to date.
Its such a smooth board and gets up and going very quickly, as a quad its fast and draws long turns but I like it better as a thruster (I have my Vanguard surfboard setup the same way).
Very impressed with the weight too - I had one of the first firewire kiteboards and it weighed a ton, the new board is pretty damn good I think.
Really enjoyable board to ride