Plummet said..
The thing is. You can turn a fast kite into a slow kite by flying one handed with your hand in the middle of the bar. Let the bar out fully and you have super docile kite.
You can't make a slow kite fast!
I'm sorry but that's one of the silliest things I've heard... You most definitely can't make a fast kite slow. (Especially if you are into un-hooking or riding the kite how it's supposed to be tuned.)
@ Big eeeZeeee, the truth is the reason I think most people really want a super fast kite for waves is so they can swing it around easier to fix mistakes in sloppy wave riding. People who want a super fast kite are generally hooked-in riders who enjoy getting whipped down the line at warp speed, I can't think of any Park and ride type riders who would like a warp speed kite. Park and ride type waveriders generally want a slower kite because they aren't moving their kite much while riding anyway, merely letting it drift with them down the line. The faster the kite becomes the more they have to worry about adjusting it back into the right position, taking away from cocentrating on the right position to be in on the wave (which is fairly important when you are riding this style).
Now I'm not saying that anyone should ride in a particular manner, or that you're want for a particular speed of kite isn't valid (because it is), I'm merely giving some explanation as to why I think people like these things.
p.s. This situation is much the same as hooked-in freestyle Vs "Wakestyle"... and to be honest it pains me to see that brands cater to the least progressive direction almost all of the time. I'm yet to see another extreme sport where product design and development is almost 99% directed at the average joe.