I'm sure there are differences between the 1, 2, and 3, (horsepower mainly, from what I understand) but I've only flown the -2.
If I remember correctly it had a fabric fuselage with metal wings, although the flaps and ailerons were also fabric. Fun airplane to fly, feels like riding in a big kite. It was a blast to take around the pattern.
The bad side is that they're all very old. I'm sure some have been "let go" and are barely airworthy while others have been maintained/restored well. Nothing inherently wrong with the airplane as far as I can tell.
Also, it has leading edge slots, so it's **CENSORED****CENSORED****CENSORED****CENSORED** near impossible to do a power on stall in it unless you feel like pulling some G's.....that thing will wallow around at 35-40 and you just run out of pitch authority. Fun stuff.