I ended up getting it as a part of the summer sale. It's unlike any other EQ I have and I was lacking a "mastering EQ". I was just demoing various plugin alliance products after getting interested in their compressors and passeq ended up being sort of the eq I didn't know I needed

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It's great for master bus, you can very easily glue the mids, open up the highs and beef up the bass. The highs are very strange tho, sometimes it feels as if nothing happens when you turn the knob, but sometimes it opens up very discreetly. I'd almost say the highs are the weakest point for my use. So far I'm most impressed by the mids and bass.
The m/s possibility is nice, but I need to look more into it.
Actually it's the only EQ I've used in the last few tunes, even on instruments. I guess that's pretty normal with new gear. Time will tell if it really sticks with me, but I'm pretty sure it will stay in the master bus for a while.