I've had my marvel 12 for about 4 years now. Love this boat. So does my jack Russell.
Owner of LL Marvel 12' for a few years. PRO's: at that time is a metal frame high back and legs supported seat, and easy entry and exits, design give a steady balance and cuts water with ease. Spending 1-4.5 hours at a time. Comfortable and super easy to handle for portages. Have not used it on a river or WW, yet. CON's: sits a little high in the water. Had to give up the Wolf River. I would recommend this one.