Love mine. I have a patch bay so that I can bypass it if needed (I don't very often). I find myself using it primarily as a clarifying EQ. None of my EQs can lift a mix out of the mud like the MP. It can scoop boxy low mids and lift dull high mids rather effortlessly. If you choose the right settings, the mix barely sounds EQ-ed afterwards... it just sounds "right." Occasionally, I like it for a touch in the sub range (47hz on band 1 is a favorite, when it's required). I don't do much with it in the extreme high end. The filters get some use, but I have the non-mastering edition, so HP and LP options are limited for me (sometimes wish I had the HP/LP options in the mastering edition, but I'm more likely to build a custom HP/LP box in the near future, actually).
Truly unlike any other EQ. Use your ears and don't freak out if you've seemingly selected what looks like an extreme setting. If it sounds good, it is good.