Twenty years ago my first Pentax was a dead cheap second hand ME-F with a 50 mm f/1,4 attached to it that i bought at an auction of confiscated goods . It was sitting in a sportsbag together with a carton off smokes ,a bottle of 12 year old scotch a car stereo ,a sledgehammer and 3 crowbars lol . I got the entire bag for about 30 $. After one roll of kodak 200 i was sold on Pentax forever and it was a faithfull workhorse for more than 10 years until the shutter failed , that 50mm is still going strong though and still gets use on my K-10D ,K-30 and sometimes even on my MZ-50 or my "new" ME-F ( i missed it so much i had to have another working one). I love old gear and i actually only bought that K-10D a couple of months ago (only 150€ with kit and 2 batteries) ,that CCD sensor feels like film,love it
I love the fact you can get so many lenses to fit on the modern Pentax DSLR's and i don't even own a M42 screw adapter yet
My main camera now is the K-30 ,and i love it as much as i do the ME-F