I'm happy with my Spotmatics and all my screwmount lenses, though I wish I had mirror-lockup.
Usually the finger-flick on the shutter button trick will lock up (actually pre-release) the mirror on Spotmatics. As far as I know, that's true for any of the Pentaxes based on the Spotmatic design, including the MX.
I do use a digital device in my photographic pursuits when necessary.
When someone rags on me for using film, I use a middle digit, upraised.