I've got a '93 reissue that someone sloppily stuck a crap bridge humbucker in. It's a very twangy sounding guitar and great for dirty blues. The 22" scale is pretty interesting.
Since your joining the "Fender short-scale awesomeness club" you might want to check out http://www.jag-stang.com there's a great forum there and lots of info on the "other" fender guitars. Most everyone there likes all those "other" guitars as well, like old Hagstroms and all those wacky 60's Japanese guitars. I've been going there for a really long time and I like it.
Traded a 67 Duo Sonic II in college for a bad of weed.....a B I G bag of weed. Felt like I got a good deal then.......... played one again recently and STILL think it was an OK trade.
Seriously though, they are fun little guitars, but just dont play and sound as good as strats and teles.
I went through a Nirvana/Mustang kinda phase in the early 90's, and the Duo-Sonic II's had the same switching as the Mustangs without the crappy vibrato system.
I have some old cassette 4-track recordings with one of them on it somewhere. I haven't tracked with it recently, though. I think I may need to do that.
The '64 has a shorter scale and clay dot-markers and the pickups sound great distorted. The '65 has the longer scale (well...long for a short-scale gutiar) MOP dot-markers and the pickups are a bit brighter than the '64. the '65 also has this really nice flame on the neck...it's crazy. It's a much nicer neck than should be on this thing.
I didn't care for the MIM "re-issues" if the Duo-Sonics they did in the late 90's, though.