The long and short of it is that this is an impractical grinder that I wouldn't recommend.
The weight and chunky design of the grinder is interesting and fun - not to mention how durable it is - and the color range is vast, but the functionality is not there. The best that can be said is that the finished product is almost always evenly ground and fluffy. Also, the kief scraping tool is great; it really was designed perfectly for this grinder.
There are no teeth (or sharp, teeth-like parts) in this grinder, and the curved edges of the (too few) blocks used to grind have zero ability to grind anything close to sticky bud. (Dry herb and trim - not stems - are easy to grind.) The grinding blocks get gummed up quickly, and - because of the way and shape in which they're cut - it's difficult to scrape and collect what's left (even with the kief scraper).
Even more frustrating than having to extensively hand break bud (and lose sticky trichomes in the process) before grinding, is the actual act of grinding the bud. Because of the design of the base and lid (with rugged hand grips), and because it's a three-piece, two-chamber grinder, AND because of the smooth finish, the only grip and resistance you have when grinding that super-hard-to-grind herb is the base, which tightens the threaded center piece to the point that it's nearly impossible to unscrew and open. Additionally, because the center piece is super narrow and completely smooth to begin with, there is nothing there to grip for even normal resistance unscrewing. (If it's super tight, I usually take the top off and use the whole center piece to get a good enough grip to unscrew the base, but a standard jar opening grip would work, as well.)
Overall, it's just an impractical grinder and a hassle. Is it better than a $10 gas station grinder? By miles. Is it worth buying? No. I buy my glass exclusively from GRAV, and I'm going to stick to glass.
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