I didn't have the experience the OP asked about - rather I'm having the exact opposite experience. A couple months ago my PS Audio PowerPlant 15 quit initializing. I didn't think I missed it that much but since I got it back on Tuesday I have not been able to stop listening. It sounds so so good - more space between instruments, better soundstage, fuller tones.
PS Audio wasn't forthcoming about what was wrong with the unit but it was repaired under warranty. I was told it was "upgraded to that latest Rev “B1”" without further detail. I won't be ditching my regenerator anytime soon.
Matt