I have not heard the M3s, but I bought the M50s a week ago and am still in the break-in period, but I have noticed the same thing about the mid range that ravi-singh says about the mid range on his M3s. It seems a bit recessed (or less pronounced). I am strongly considering moving up to the M60s

Question for Alan: Would I notice a pronounced or significant difference in the mids between the 50s and the 60s???

Thanks,
Randyman