Well, after nearly a week with the MJ, I can completely honestly say that I am very satisfied. It is so tight, crisp, accurate and punchy. It is PERFECT for the kind of music I listen to. It's never half-hearted... it always attacks basslines with authority and confidence. I've played it high and low, and it just asks for more. It has very impressive low-end. After some break-in time and tweaking (the most noticeable change was swapping the phase), it seems to have gained some clarity.
One thing that thoroughly surprised me is the output. I wasn't expecting much, because it is has lower power handling and excursion, and its in a sealed enclosure. I mean, it's nothing extremely special... definitely not as loud as my L7 (Although it had nearly 4x the power, and was ported), but it will still get up and boogie for a sealed sub on 600w. It is very efficient.