I've been meaning to post in this thread for about a week now, but have just been behind. I've got a Rhinosaur - I actually worked on the graphics, and Matt paid me with the second production pedal of the run. So far, I've played it through my rig (Genz Benz Shuttle 6.0 driving a custom 2x12 cab), through a test rig at my local shop (Empire Guitars in Providence - we used a powerful little Carvin combo), and through my computer (using my M-Audio Fast Track Pro as an interface, and default Garageband amp sims)... and it slays through everything.
On the whole, it adds serious mass, and the tone knob has a crazy wide sweep. When I played it in the shop, it was seriously rattling fixtures... and we were at pretty tame volumes! Through my practice rig, I ran it in parallel with my Red Menace (the Red Menace going into a modded Fender Bandmaster), and it pretty much sounded like the sky splitting overhead.
The fuzz character is kind of vintage-y and buzzy, and sort of "sits on top" of the tone, if that makes any sense. It certainly doesn't sound like a clean blend, but there's definitely no loss of lows (in fact, you can add quite a bit if you want). Last week, I forgot to bring it to practice, and found that I had to run my Pitch Fork at an octave down to properly fill out the parts that had previously felt so huge with the Rhinosaur.
So yeah... on the whole, I'd say that it's pretty great. I don't think there will be any problems cutting through, but as always, YMMV.