I bought a Pass Labs XP-12, used for about the same price as the Bryston and Benchmark preamps. I will get it tomorrow.
The reason for the switch to Pass is that the buzz around the Pass gear is that ii is warm(ish) sounding. The other two are probably neutral. I'm looking for a bit of warmth, so...
I replaced the 38s with an old Apt preamp, I have recapped the PS. Yes, it sounds different....better to my amazement. Vocals and strings are a bit clearer and the entire sound is smoother, with no audible edges (the Apt is from 1978!). Only downsides are no balanced lines (XLR) and no remote. I've made a special cable to change male XLR to male RCA. No ground loop hum. But the lack of a remote is a bit of a pain.
Anxious to hear the XP-12!