Vortex Sound Research

Has anyone ever heare of the above mentioned Synthesizer? I have the chance to get one for a fairly little amount of money and would like to know if there are some of you enjoying this synth. Of course, as it is a russian synthesizer and i don't know any russian it wwould also be incredibly helpful if anyone knows where to get a manual (dont worry, at least the parameters are written in English in the model I could get