Interesting looking boats. I'm not sure why they call them kayaks though. They look to me as if they have excellent initial stability, almost zero secondary stability, and would require a lot of muscle to move along at the speed many kayakers and canoers paddle. That square stern has always made paddling canoes tougher, just as a comparison.
I wouldn't want to be out in anything with poor secondary stability unless it was a jon boat and had a motor.
Another place to ask opinions is the fishing or general advice forums on paddling.net
Good luck with your purchase!
Diane
"If I'm not going to catch anything, then I 'd rather not catch anything on flies" ... Bob Lawless