I know this thread is a bit old, but we are still suffering light wind madness.
I got a chance to ride yesterday on a 15M Speed 2 out at Honeymoon in 8knots. There was a ton of surf, very choppy conditions, and a current that was working against you the entire time.
With that said, I rode for about an hour with this kite and a 139X43 twin tip.
As Eric said earlier, being light helps as I weigh 150lbs soaking wet.
I was amazed at the kites ability to create power in such light conditions on a not so big twin tip nonetheless.
Cabrinha has also launched for 2011 a dedicated race board. Can't wait to try one as I could probably ride daily down on IRB if I wanted to. Boards certainly will last alot longer than kites.
Here are some YouTube links that I found.
Enjoy, and I look at kiteboarding in the summer as sailing more or less.
http://www.youtube.com/watch?v=JJq6SrDYxDE
http://www.youtube.com/watch?v=_4763XQI6uQ