Have look at the question & answer on the ebay listing....
Q: 55Knots, sure you didnt mean km/h. Sounds incredibly unrealistic / complete load of bs 12-Nov-08
A: lol thanks for the relpy where u kite? and yep ive been out a couple of times in supper strong winds on this kite and now ive got myself a new 5m for high winds
Does that mean the new 5m is for when it is over 55knots