well it's all very well ditching your m1 actives for mackie 824s or the bm15
they are unbelievable yes, but the price different here is what, £600 or something??? i would hope they are in a different league
I know of many records which have been made originally on far worse monitoring systems than the m1 actives
Monitoring is a personal thing, whatever works for you and if i could afford a pair of 824s I would be straight there, but otherwise you shouldnt disregard the m1's, they serve a purpose if you learn to use them properly