Sorry to run against the grain here: very much enjoy working with BW conversions off of MFDB, and there is lots of capability/flexibility there. Had an MM, but somehow it only worked for me when the light was just right - I had a lot of middling grey days where the images just seemed very flat to me. But in the right light, got some real killer shots. However it was limited with highlights and ISO, although it seemed good at the time.
Took the plunge, and traded it and some gear for an M10M, and never looked back. The new sensor makes magic out of almost all kinds of light, lots of flexibility. Sure, you lose the color filtration (after the shot) flexibility and that gave pause, but its overall usability is so enhanced that the camera is a dream to use. I have it set to min 1/250 shutter speed, so blur is no longer an issue. And it can shoot well into areas and zones that were previously tripod only. Like inside dark caves, etc. Tweak the files in C1 (v20 works well for me), adjust the curve for more contrast, and those flat shots in late afternoon light come out full of richness. Don't ask me how...
So... yes... it makes little sense. You give up some things, doesn't seem like you get that much more... until you use one. More fun than should be allowed.