Owning a pair of M60s, here are my (SUBJECTIVE) impressions:
1. Speakers definitely sound brighter than the other speakers I've auditioned/heard
2. If you play a movie soundtrack in stereo mode, (pure direct on my Yammy receiver) I feel that the speakers lack bass punch...this may be because I'm used to hearing the tracks with my subwoofer on, but this is subjective.
3. Music sounds good though, but pairing up with a subwoofer sounds better to me.
I have to say that despite the slight lack of bass, the speakers sound really good to me. For instance when watching Black Hawk Down, during certain explosion scenes its like you can hear the individual grains of sand fall back down to earth, so it feels like the sound u get is incredibly clear and detailed, but I wouldn't go as far as to call it harsh.
I don't think u'd be dissapointed with these speakers, the only question is do you think the speakers are worth the money u pay for it. I don't see you going wrong with them if you pair 'em up to a good sub.