Mdowns, I also went from the X1 to the XP10 and got it from Mark too, and yes, what a great upgrade! So much better bottom end, better volume flexibility, better remote, better gain structure, and great at low levels. Warmer sound too and more musical. I bet Mark said the XP30 was great, for 16K it better be! To Rockitman, my read on the owners manual for the XP30 (now posted on the Pass Labs site)is that they really did make some big advances on the circuitry and power supplies that would lead me to believe that it does offer significant advances in SQ, but I would think you'd need a very high level system to enjoy those differences. And a bunch more cash. I'd sure love to hear it.