To me, the Spotmatic II is the most elegant and simply beautiful of all. The feeling of quality is on par with my Hasselblad, Rolleiflex, and Leica. I can live without the hot shoe (I use a potato masher flash), stop down metering, and screw mount lens mounting speed (If I'm shooting action, I generally use my DSLR). I love the compactness of the Spotmatic line in general, but its apogee was the was the Spotmatic II in my opinion. I use Wein cells or a hearing aid battery with an o-ring, and alternate between the TTL meter and a Gossen Luna Pro. I get a tactile and visual pleasure every time I wind the film advance, press the shutter button, or focus one of the Super Takumar or SMCT lenses. Even fitting an M42 threaded lens to the mount is a pleasurable experience. I have more fun using my Pentax outfit than any other 35mm or digital camera I own, and that includes my Leicas.
Andy