The 220 isn't a field approval. Its an STC by Seaplanes Inc, and still available for any -1, -2 or -3. Super Stinson Inc has the STC for the 0-470. Supposedly you will be able to buy the 220's brand new after the first of this year. Check out the Stinson owner group website for info. Spent 10 days in Canada last month with a my Stinson (a -3) on 2425's, a friends C180 on 2870's (a nice light 56 model). We both carried 3 people, tons of gear, and full fuel (50 gallons for me and I think he carried 55). First time I had a chance to go head to head with a good 180. Loaded roughly equal, with each of us carrying about 1000 pounds, my Stinson was easily out of the water first. Climb was about the same. The 180 was about 10-15 mph faster in cruise. At one point I hauled four people, and he hauled two. Off the water was about the same, but the 180 was way faster in cruise when I had a lot bigger load. It's like my Stinson was pulling a parachute. It actually flew nice and felt right, but could only get about 95 mph out of it, and the 180 was about 120mph. That 265 pound guy in the back seat with 4 cases of beer and 100 pound pack really slowed my cruise. When we went back to 3 people each I was up to about 105-110 mph and the 180 cruised at about 115-120. In a 100 mile trip, he got there less than 10 minutes ahead of me. He burned about 15% more fuel than I did. Both great old float planes very capable in the bush. If you're going to fly the Stinson on floats, don't get the 150 or 165.