I've spent a week with the MM5's now and feel I have a pretty good handle on their sound. Take into consideration that these observations are what I hear, in my room, with my equipment. Your impressions may be totally different.
The bass coming from these speakers is abundant and clear. They handle the slam of electric bass and the nuances of acoustic bass with equal authority. I've never had a speaker that did both well. Drums sound like drums and not drum machines (unless that's what the recording is done with).
The midrange and highs are very natural. Voices are clear and precise with just a hint of sibilence(probably more to do with the recording process and my equipment than the speakers). Acoustic guitars sound very real (I play, I know what they're supposed to sound like!!). There is no presence of "in your face" harshness at all. I listened for hours at a time and suffered no listener fatigue what so ever.
I think Tyler Acoustics have hit a home run with the MM5, especially at the price they're asking for them. My dealings with Ty Lashbrook was the most enjoyable experience I've ever had in buying audio gear. You will not find a better person to do business with. Ty told me he is taking a pair of MM5's to AkFest so if you plan on attending the event, I highly suggest you visit his room and give them a listen.
Disclaimer..... I'm not a professional reviewer,can you tell!!!!!!!