I'm no expert on the Beatles, but from what I have read quite a few people believe that more time and care was placed on the mono mixes of the albums as stereo was a bit of a novelty for pop records at the time.
George Martin supposedly said: "You've never really heard Sgt Pepper until you've heard it in mono."
My experience after 'finding' mono versions of several beatle albums is that the mono versions were clearly better to me. The drum and bass in particular were much much better represented. I would put it this way, I never really thought of the Beatles as rocking until I heard the mono mixes.
That said, whatever was done with the stereo mixes to lose drum and bass impact and level may be fixed with the remaster or the mono may get ruined. Remasters are always a crapshoot. They are not remixing though so my guess is that the original stereo mixes were compromised as far as low end impact goes and will forever be that way.
The bummer is that they are not selling the Monos separately. The Classy thing to do would have been to issue all the albums as double cds with both versions.
