The difference will be dramatic between the M80v3 and the M60v2. I switched out my M80v2 for the M80v3 and was amazed at the openess within the midrange and the smoothness of transition to the top end. As Jakewash says the best is to audition the speakers for the 30 days in your home (what better way) and on the off-chance you did want to return you can do so.

Brent Tombari
Axiom Audio Expert