I have the M3v4. It's truly amazing. You can read my lengthy review on the second product page. I don't know about the PSBs but I can tell you the M3 easily bests the KEF for music and movies. The M3s as fronts totally fill my 4,200 cu.ft. space. When I took the blind-folds off listeners, they could not and would not believe they were listening to the M3s. They best my old M80v2.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated