I have a couple of Fujica ST-801 bodies, bought for the same reason as the OP and because of the various reviews I read, it has the brightest viewfinder and a well-regarded meter. The metering only works wide-open with Fujica EBC lenses, though, other lenses have to be metered stopped down which makes them more difficult to focus. I believe that's the same with other M42 cameras, something to be aware of as it's an annoyance when you're using the camera.
No doubt I could get used to it if I put my heart into it but my desire for M42 has abated since discovering that. My view now is that if I'm going to lug an SLR around with me, I might as well take one that can meter wide open and has good support and a wide range of lenses, which my FE2 does.