After using this grinder for a few weeks, I've found some issues with it that compelled me to write a review. I'll start by saying that if you plan on using this to grind beans strictly for the AeroPress or an espresso machine, it should perform just fine. If you want coarser grinds for something like a V60, though, you may start running into issues like I did. Let me preface this by saying I'm a mechanical engineer, so things are about to get technical.
The design of this grinder combined with the manufacturing tolerances of its parts lead to a pretty loose fit between the rotating shaft and main chassis. Basically, the whole assembly gets wobbly once you start loosening the thumbnut on the bottom. There are two burrs in the grinder. One is permanently attached to the chassis, the other is fixed radially but floating axially on the shaft. The point of the thumbnut is to change the axial distance between the burrs, thereby changing the size of the gap between them. This gap determines the size of the grinds that come out of the grinder. This whole design is dependent upon the burrs remaining concentric, but as soon as you throw a wobbly shaft into that mix, your ability to get consistent grinds goes out the window. If the shaft is able to wobble, the gap between the burrs is larger on one size than it is on the other, so your grinds range from incredibly fine to incredibly coarse, when you really wanted medium-fine. A side effect of this wobble is that the plastic components up at the top of the grinder get worn down by the sharp edge of the cap as you crank the shaft around, thereby creating a fine plastic dust that deposits on the top of the cap. I wouldn't be surprised if some of that powder was created on the underside of the cap as well, making its way into your coffee grinds.
Another minor gripe I have is the design of the plastic cup in the bottom portion of the grinder. It has a little channel around the inside edge that catches fine grinds, and you have to smack the bottom of the cup when pouring your grinds to get them all out. It's not a big deal, but if the bottom of the cup was just flat, this wouldn't be an issue. I don't see any reason why it has to be designed this way.
With all that being said, this isn't a bad grinder. It makes good fine grinds, is pretty easy to disassemble and clean, is small, and is good looking. But if you need coarser grinds, I'd think about picking up something like the Hario Skerton. There's even an aftermarket brace you can buy for it to avoid the exact problem this Cozyna has.
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