I used to have a Salyut (the precursor to the Kiev 88) with a 90mm lens. It was a bit clunky and crude in operation, but mine was reliable enough in the couple of years I used it regularly. The lens was really good, and I liked the quality of images from it. It was certainly sharp enough for my taste, although perhaps not as sharp in the corners unless stopped down a little. I stopped using it once I got hold of a Rolleiflex, and eventually sold the Salyut as I prefer the compact TLR form factor.
I might have been lucky, but i had no reliability problems at all with the Salyut, though.