I have and love our M12. We sail it all the time with two adults (although skinny adults) and two kids 4 and 8 yrs old. It’s works great with our crew although it’s not sports. Someone’s sitting on a jib sheet or on a block and we are usually pulling some toy boats behind us and someone’s sad because their toy boat isn’t making as many splashes as the other. With two adults its great fun. I actually like it best solo as I like being the main ballast being able squeak a little more speed out of the lighter winds and pretend I’m racing. Lastly to make things more confusing, all four of us sail in a single sabot. Yeah people take photos and there are body parts everywhere in the boat, out of the boat but we are laughing and floating. We have a few more pounds before the kids are too heavy and we sink. That’ll be fun too. jP