That grinder got good reviews, but also really bad ones. Here are just a few bad things people said about it. They don't last long before they break. Maybe it's because of all of the coffee that's sucked into the part where the motor is. It makes a fine powder no matter what grind you set it to. Or it leaves big chunks in the grinds. And it never grinds the same amount twice when the setting is the same.
If it works right then you're one of the lucky ones. Some people aren't so lucky. To make inconsistent grinds like some people say it does, it sounds like it's not really burr mill at all. Some cheap grinders that claim to be burr mills only have one set of teeth, and not the two sets of teeth grinding together that a burr mill actually has. But I don't see a picture of the innards and don't know what it is. It's probably still a lot better than my coffee grinder.