I took a playboat in there at about 52K and got stomped. Worst swim of my very young kayak career, in fact worst swim I've had. Lucky to be writing this actually.
That being said it is fun and goes fast, lines are school bus sized, so are the holes and waves. A couple of the holes are so big they are unrealistic, easily avoidable but do not play around.
Have fun, stay in your boat at all costs, and leave the novices at home.
I've never boated before, but I have posted a lot on Mountain Buzz!