M2s with a sub are *really* good in terms of sound quality; the only caution is that because they are small speakers there are limits to how loud they can play.

I have swapped between M60 and M2 mains when demo-ing the system and the sound is *very* similar at moderate volumes.

On the other hand, if you are prone to saying "listen to *this*" and cranking the volume up to wall-of-sound level (say for the helicopter crash in the first Matrix film), the M2s won't keep up... but that's not a surprise.

I was *very* happy with M2 + sub (no center) as my first HT system. In my case I next added a pair of crappy speakers I had sitting around as surrounds and went through a series of one-purchase-at-a-time improvements -- but IMO the two "big jumps" in enjoyment were (a) M2 + sub, (b) replacing crappy surrounds with QS8s.


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