I haven't seen anything, including my $7,000 Leica camera body, that is without the lens, that doesn't have issues from time to time so to say that money/cost denotes better QC is by it self misplaced. Which amp sounds better I don't know but mine has plenty of use and performs and sounds fine. My Leica M9 has been in the shop twice since May of this year and Leica is known for Ultimate quality. . . just an example.