Just finished paddling Michigan's Manistee river from Grayling to Lake Michigan on a 5 day adventure with my 13 year old son. We averaged about 45 miles each day. For this trip we purchased two older polylink 3 138 loons on CL. The boats performed flawlessly and were truly a joy to paddle. I am a bigger guy 6'1" 220 and the boat was perfect for me and my gear. The 138 was very stable and easy to paddle in the river and the two lakes we had to cross. The polylink 3 is heavy but bombproof. We had two portages and took along wheels which were nice!
The cockpit is large and very comfortable for long days on the water. We used gel seat pads and I would recommend them with this boat. The seat is nicely contoured but hard. If you are looking for a do it all boat and are willing to trade weight for durability, the 138 Loon is worth a strong look. I should add that we also own a Pungo 12 which is a really nice boat as well but given the choice, I'd go with the Loon any day.