I have a Black Max II, strung with Gutex Ultra 1.30 multi @53. I got it cheap used off the bay. It's very, very flexible and flutters quite a bit if I string it above 53. It has a lot of feel, but I'm noticing that it has kind of a boardy string bed. So I added a little weight to 9&3 and I'll see if that helps it improve. Maybe I should move the weight to somewhere around 10&2 fro better pocketing.
I've never had a Black Max, but I held one once and it gave me the impression that it would be stiffer than the Black Max II.