A good friend of mine paddles one and I gave it a quick try. It's a really fun & nimble small boat. It's certainly a special kind of kayak but loads of fun. It's faster than you'd expect it to be but obviously not comparable to a modern (race) creeker. I only tried it on our slalom course (WW III+)so I don't have any "real" but for lower volume creeks with lots of features this boat seems pretty perfect.
But on the other hand I could also envision a Braaap for this kind of stuff