Sorry, I can't speak for the KR-10. I've the Sears KS-2 (Ricoh XR-7) and I do like it. I've been considering an all-manual model that takes the k-mount lenses as a backup. Ricoh's are quite capable cameras.

This page won't give user experiences, but you may find some of the information interesting:
http://www.drricoh.de/SLR/

If it is similar to mine, the only real complaint I have is that the meter is LCD and there is no back-light, so it can be difficult in low-light situations. Also, expect the foam light seals to have degraded by now and be in need of replacement, and little bits of the foam can stick to the shutter and cause issues. I cleaned mine well, and used felt and wool yarn as replacement light-seals.

A lot of the Ricohs of that era are similar, and I may have a KR-10 for parts somewhere, but haven't used it.