An absolutely brilliant camera and my favorite rangefnder. This camera has satiated my Leica, Contax, interchangeable lens "system" rangefinder, Bessa, Canon, Nikon, etc., etc., etc., lust.
It's all you want in a rangefinder. The lens was heralded as the "best semi-wide optic ever tested..." in its day by (don't quote me) by Popular Photography (or Modern, or some such...). So, le "objective" doesn't suck. It's tiny, lightweight, solidy built, with a very nice rangefinder. It's just about as quite as the GSN or any Leica, is fast in operation... It also has an interesting flash-fill system that's easy to use and very effective. A useful feature.
I'll take this over the much higher priced Hexar AF. Why? Because it's repairable, smaller, and less expensive. Iit's a simple shutter priority model with a "real" rangefinder. Once the electronics go on a Hexar - rotsa ruck. Literally, the Auto S3 is a perfect street shooter.
Downsides? Top ASA locked at 800. No manual control. Otherwise, perfect.