I've had Pentaxes a long time, and find them very comfortable to use. When my wife got interested in theatre photography, she chose Pentax too, starting with an ME Super. That one was junk after she spilled Coca Cola on it, and we got her a Ricoh XR, which didn't last even as long. Recognizing she's hard on gear, the next choice was the weather-sealed LX. When it went to Pentax for repairs, we got a second LX body as a spare; good thing as the first one was lost in transit. Thus a third LX, and she used these two thoroughly, almost to destruction before being "done" with the theatre work. The LX's went into storage for a few years, while she switched to a Nikon digicam, but I eventually dug them out to see if they worked. One was "used up" and the other went on to successful rebuild by Mr Hendrickson... not pretty, but it worked fine. Then I found a real clean LX on eBay along with a 1.2/50mm SMC. So we've had experiences with LXs!
For some reason my Pentaxes seem to come in pairs, so I have a bunch of "two each": 110 Auto, 6x7 (1 non-MLU), 67II, 645NII, Pre-Spotmatic (K + H3), Spotmatic Motor Drive (just one), ES (one is ESII), K2 (1 chrome, 1 black DMD), ME Super, MX (1 chrome, 1 black), LX, (ZX-M + MZ-M), (ZX-5n + MZ-3), and dSLR (K100D + K20D).
Being so "invested" in Pentax, there's little interest in branching out to other SLR brands, but I did inherit my Dad's Olympus Pen FT, added another FT and an FV, then got a cheap OM-G so I could use the Tokina 500mm mirror I'd gotten in OM mount by mistake!
I have no reservations about Pentax lenses; they've been outstanding all along. I read once that Asahi Optical had early-on set their goal to match or exceed Zeiss quality.