I took the mid-size one on a 20-day Grand Canyon trip last April. Loved it, for that trip...... Rented, didn't buy. I paddled it every day, even the last down to Diamond, where we found one of the BEST surf waves on the river at that level. It was amazingly stable (I only got knocked over once running stuff, on a huge eddy line), FUN to surf, flat-spun way better than I thought it would, and was really easy to paddle in big water. We had upwards of 18,000 several days, including Lava, and it never even slowed down in there. It was comfy, great for rescuing swimmers, and it was a decent river-running play boat. It is definitely not for throwing ends, loops, etc. But, I could stern squirt it forever.... Think more of a planing hull RPM. I liked it, but it wouldn't be my primary play boat, and I'm not anywhere near the cutting edge of current playboating. A great second boat for long trips on big water, where catching big, fast waves on the fly is more likely than eddy-accessed steep features. Could work for stuff like the Gore race, too, as it was really fast and surfaced well. Hope this helps.
So many rivers, so little time..........