I bought one. Loved it. It did exactly what I wanted, and since I couldn't afford a Nikon 85mm f/1.4 wasn't in the cards.
Notice the past tense? 13 months after I bought it, just past warranty expiration, the aperture began sticking open. Unless I intended to shoot at f/1.4, everything was overexposed.
I don't use it anymore. Since it's now worthless, I'm going to disassemble it and see if I can fix the problem.