Just a couple of weeks ago I picked up an Aires IIIL from the esteemed Jon Goodman. Camera was in perfect condition, it had only one previous owner before Jon, and apparently serviced regularly. And anything you get from Jon is going to be in top condition.
The camera has the same quality feel to it, like Zeiss cameras from the same period. The shutter is incredibly quiet. After I had shot about a half-dozen shots with it, I thought, this thing's not working.... but of course, it was.
The viewfinder has framelines, which help in composing, also it is an advantage for people like myself who wear glasses. I can't see the entire field in the viewfinder, but with the framelines, I can still see what I'll end up with on film.
The 1.9 lens is very sharp, and will focus down to 18 inches.
Beautiful camera, I'm extremely pleased with it.