Me and my sister were trying it this weekend and having fun. One of us would lay on the skate (foam top!! wouldnt recommend it on skate grip...) and hold onto the handles while getting pulled by the jetski.
At about 7mph it will start to plane and go nicely, then you start to get some enjoyable bumping at 13mph. We didnt make it past 16mph before either falling off or letting go in fear of a smack from the board.