I flew one in Alaska a couple years ago. Very nice airplane. . . of course this one had a 200 HP Continental, constant speed prop, hollowed-out interior for more cargo space, tundra tires, gull-wing doors, and skylights all around! Empty it didn't take more than a couple hundred feet to take off!
Awesome airplane! I'm not a Stinson expert (flew that 108 once, and have about 25 hours in a 10-A), but Stinsons are great airplanes. The wing design makes it very stable, the slots in the wings make it hard to stall. Excellent training airplane, I'd say.
I'd check out how "freshly restored" the airplane is for $22K. Is that with the aluminum fuselage or fabric? I think the 108 has a wood wing spar- check that out when you're shopping to make sure it's not rotted.