Received my SW III's from HCK today, at last.
OOTB they sound rather sibilant and bright to my ears, with plenty of deep bass... but I understand these are supposed to require many hours of break-in so I'll start by running them overnight and seeing if there's any smoothing out tomorrow. This is with the standard, installed tips, by the way.
350 hours of break-in? Really??
Cheers.
Finding the best tips for the SW3 that suit you, will bring about the biggest difference. Burning-in brought about 5-10% difference for me, but YMMV of course.