I guess the question is whether in fact the many models and revisions of
those products over the years were in fact the result of continuous
improvement of preamplifier performance, or in fact the result of
calculated product marketing strategies geared to driving demand. Both
are legitimate and a business is certainly entitled to do whatever it needs
to do to drive sales and stay in business (and providing good products and
customer service is an essential part of that, and ARC certainly does make
good products and at the pinnacle of customer care). However, I feel that
the principal circuit topologies needed for building a good sounding active
line stage with gain have been around a long time and very little has really
changed in that regard, other than some better parts with tighter
tolerances (perhaps). So yes, ARC makes very fine products - they always
have. But I don't believe the "improvements" overtime is to the
degree which all the models, revisions, latest and greatest announcements
might suggest. That is I think it is every bit as much driven
marketing/advertising principles as it is by technical ones. That doesn't
mean there is any reason not to own an ARC preamp, they are very fine
indeed.