I like this tileset. In general, I like the monochrome tilesets, but so many roguelikes use tilesets these days that I'd really like to see more traditional ascii based roguelikes. (full disclosure; I'm the guiltiest of all about this, but my next roguelike will use ascii, I swear) The monochrome tilesets I like because they're kindof half way between ascii and a real tileset.
I agree that exclusive tilesets are a cool thing to have, but roguelikes were founded on the ultimate non-exclusive tileset, ascii. All the classic roguelikes used essentially an identical tileset, so exclusive tilesets while nice are not always necessary.
Anyway, great tileset oryx, and a good price, though it'd be great if one day you released it for free. I'm not saying soon, but some day, eventually.