I have had my m60s for TWO WHOLE DAYS. And I'm a huge bass addict. When I first demoed them at squirrelz's with and w/o sub I thought I badly want a sub and was considering the m22s + a good sub. But I couldn't be bothered with upgrading every 3 months so I got something (the m60s) that would last me longer and I'm really thrilled at the fact that it will sound even better when I eventually :
1. Get a sub
2. Upgrade my denon 1604 to a more powerful one

But bottomline is, I thought I'd really miss the sub but right now, i don't, the bass is fuller and more satisfying that I had imagine it would be!