Excellent cameras! Some fine photographs have been taken with the Spotmatic and its derivatives. I've always believed that every photographer should at some point own a Spotmatic. When I was getting interested in the early '70s they were beyond my pocket, but two days ago I bought another for my collection of Pentaxes (an SP2) in very good nick for ten quid (although they're cheap and easy to fix anyway). Excellent lenses, now to be had for peanuts on eBay, and even without the battery, all shutter speeds and are operative. As for the handling, I quote the adverts "Trust your hands to tell you it's Pentax!"
Steve