When I PM'd TwilightOdyssey about a pickup for my basswood charvel, heres what he said about the MM-
"I've said this before, and I will say it again. If you only have ONE metal guitar in your possession, it should have the MM in it. It's the first and only word in metal pickups. I don't find it to be scooped at all, and you know I don't go for that kind of tone, since you've heard my CD.
The MM will push your amp hard, but I don't think it will get messy. However, you might want to use just your amp's gain instead of using any kind of boost/OD in front of your amp.
Now, for the cons ... In basswood, there might be too much low frequency energy. You can try to EQ them out, but it may make the guitar sound muddy, tubby, or indistinct for riffing. The MM was designed with a certain amount of mass in mind, and a basswood super strat weighs practically nothing. You might find it has too much boom and sizzle, in other words, in the Charvel."