I'm new to this, am 5'9" with medium length legs and size 9 feet, (men); 170 lb. Am at the upper weight range for this boat as I understand and in some respects it feels it, in a good way.
It's very responsive, not tippy, has great lines, and tracks well enough in flat water to make good headway and keep up with intermediate canoe paddlers if you're willing to work a bit.
Learned to roll on it. Sweep works nice and smooth if you lean way back. Can tip the nose under with relative ease. Let you know more as I learn more. Philadelphia area.This boat is wonderful. I cut my teeth on an RPM, then tried a 3D a few times, as well as a Kinetic and Freefall. Perhaps it's me, but the Infrared, unlike any of those boats, responds and reacts to the water _exactly_ the way i want and expect it to. I'm 5'9 about 155 lbs, and the IR feels much more nimble than anything else I've been in. It has given me tremendous confidence.
It's easy to roll, the stern is just grabby enough to do fun things with and not try to flip you whenever you make a mistake, and it surfs really well. I couldn't possibly be any happier with my IR. It's got plenty of room inside for my size 9 1/2 feet, and is comfortable enough to sit in all day. :)