I hope not
I had the MX - returned it because of the damn wheel. For one, I could never get middle-click right. At certain angles there will be an audible click, but it would not register.
For two, the freespin mode is absolutely useless for real applications (though, admittedly, it makes for a really cool toy). It is too imprecise - and I found that for scrolling through a long document scroll bars work much better.
Apparently, the MM has seen a revision bump. It was mentioned in another thread around here somewhere... http://forums.macrumors.com/showthread.php?t=339590
There it is.
Maybe this quiet revision bump will fix some of the problems with scrolling (and right clicking?) from the past.