Why are there no Reviews of the Pass Labs XP-22. Is there anyone with strong feelings?

I'm wondering the same!
I have a rockna wavedream dac, and two SE amps. An LM845 premium (integrated with pre in option) and a firstwatt SIT-3 that i use dac direct. 
I wonder if a pass xp-22 would be the answer to both. Concerned about the only 3db gain single ended, which is how i would use. I also read somewhere that unity gain is at step 89 out of 99 on volume control! It would work fine with my tube amp, but not sure for the SIT-3?

Unity gain? I thought it exists in pro audio only..

Well the unity gain as i understand it is when the preamp is passing the signal at the dac line level, no attenuation. So if I want any "gain" from the preamp itself, i will have to be at above volume step 89 out of 99. With most amps, this won't be needed, but with my firstwatt SIT-3 unusual low gain (11.5 db only), in certain tracks which are low level recodings, i might need that.
I have asked passlabs, the gain of XP-22 via single ended is 6db, vs 9.3 balanced. I will be using it single ended, and I think 6db would be enough.
I have one on order, so i guess i will find out myself in about a month!