Audio Research PH6 Phono Stage - How is it?

I know most of Audio Research stuff is top end with little complaints about anything they make. I like tube gear and have more of a preference for the tube sound but looking for a phono stage with little noise. I know the PH8 reference phono stage is a true reference standard but way out of my price range. So that brings me to the PH6, which retails for around $3,500. Not too many reviews on this one and hasn't been compared to other phono stages at a similar price point. There are some good competition at this price, especially the Herron VTPH2, which is also a great phono stage. Does anyone have any information about the PH6?

My current system is Primaluna Dialogue HP Integrated Amp, VPI Prime turntable, Ortofon Quintet Black MC cartridge, Sonus Faber Olympica III speakers. Much appreciation!