Just got my shiny new Moog FreqBox from Analogue Haven, and got it stuck in my Analog Effect. (Yes, it has occurred to me that I could have purchased H3000 x 2 for the money I've spent on this monophonic wonder so far, but... yeah...)
Initial impressions: it's freaky. Exactly how useful it would be is open to question, and depends largely on what you're trying to accomplish. The other three I have (LPF, ringmod, phaser) all have obvious uses, but this guy I'll have to ponder for a bit. But if you want to just fuck the shit out of a signal, you could do worse. I'll probably not put up any samples, as the ones on the Moog site do an admirable job of displaying its capabilities.
EDIT: At the risk of being incredibly tedious, like every other owner of boutique gear on the planet, here's a little snip of what the whole shootin' match can do to a kick drum. Delay is after the fact, courtesy of Dr. Device. (Because without delay, well, life isn't worth living.) Clip.