Been using one since 1975. Built like a tank, nice to handle, easy to use. Not too shabby lens (mine has a 50mm Jupiter 8 lens). I've never bothered sourcing other lenses for it because I've always found the 50mm adequate.
The camera has no metering... I think this is a good thing, no batteries!
Just remember never to change the shutter speed unless the camera is wound on, doing otherwise may damage the mechanism.