I several seen Mk II's posted in the FS with cracking issues after being dropped (claimed single drops, too!).
So the Mk II is probably not the IEM for me, as I drop EVERYTHING, although I'd like to try one .. I currently have the Hyla TE-5B (CE would probably be a slightly better choice for me), and I believe the Mk II has the vocal mids that the 5B has misplaced
Yep, I switch back and forth between CE-5 and Mk2 and love 'em both for what they do.