Our own grinder is the perfect middle size and features blocky teeth that don't crush herbs while they cut.
We've had difficulty with Aluminum CNC grinders of the past and wanted to improve the action. The knife shaped teeth don't seem to cut through herbs well, no matter how sharp they are. We realized the way to break up herbs is not by knifing the material, but sheering it between rectangular teeth. The old way attempted to dice the herb with a sharp edge, but ended up compressing most of it as the teeth passed each other. Our grinder with its blocky teeth does not squeeze the herb at all.
Another nice touch is that the blocky teeth won't cut you as the old grinders could.
We made a small run of these grinders about a decade ago, but decided at the time that we should focus on developing our vaporizer instead. This is a brand new batch we just created for you, and we're proud of how it came out!