There was a "one line review" on the Axiom site from someone who "liked their M50s so much they are buying M60s" (don't know any details) but other than that I believe all of the M50 owners on the board are (a) very happy with them, (b) irritatingly smug that they may have purchased the most "balanced" speakers Axiom makes, and (c) feeling just the tiniest bit sensitive and inadequate relative to M60 and M80 owners, which IMO (having owned M3s, M40s and M60s) they should not.

I have only listened to M50s briefly (up at the Axiom factory) but the difference between M50 and M60 was very small, much like the difference between M2 and M3 or even (other than the bass) M3 and M60.

From subsequent posts, the M50 seems to sound even more like the M60 than the M3 did, so the difference is going to be pretty small.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8