Thanks everyone for the feedback… 
The coolest thing for me is that these were made without first doing any sketches… my traditional process is to design something, make orthographic drawings, scan them, create Imageplanes in Maya and begin… unless I’m making something traditionally (drawing, sculpture). So to be able to so intuitively block in forms and sculpt with a tablet is just so liberating I can barely contain my excitement… telling everyone about Zbrush now. Neville Page and Carlos Huante are about to begin learning it… can’t wait to see what they do with it! At this point, however, my main gripes for using it in a production sense are that artists -are- often given orthos to work from, and Zbrush should support that… also, it should have better tools for low-res box modeling so that people don’t feel they need to start in Maya, Silo, Wings, etc… plus the topology brush from Silo would be a nice addition… Can’t wait to see the next release. But after reading posts from people like Skycastle (Cardwell) and Zack Petroc who definitely block out their forms in another package, I feel like I should probably not use Zspheres, since I already know Maya so well. But I think I need to experiment more with the Zsphere approach. Regardless, Zbrush is amazing and nothing touches it when it comes to mid and high-freq detailing, so hooray for Pixologic. And I don’t know why people gripe so much about the interface… I actually dig it.
Anyway, thanks again for the replies! I very much appreciate the positive feedback… now I’m off to continue building my brush library… been having fun creating my own alphas for use with stencils and the decobrush.
-Alex