I have owned the Merlin XT for about 7+ years and have done extensive day trips with it in the Puget Sound and Victoria. As a LARGE paddler - currently 300lbs and 6'1" I have had no problem with the stability or ability to put the paddle in the water. I am now using it as my exercise machine averaging 1hr20min in the boat and traveling at an average of 4mph (3.5knots) which puts me at a speed-length ratio of around .93 which is extremely great for such a short kayak.
Right now the Carbonlite is beginning to show its age and I will be bringing it back to Eddyline for some long overdue maintenance, I only hope the Herons I own will be as durable.