Cheap ($24 at Costco). Bigger outlet than other grinders may decrease clogging.
Negative Product Points
Finest grind not fine enough for a powerful pump machine.
We bought this out of desperation after the motor on our cheesy Braun burr grinder burnt out. For the value, it's a better value than the blade grinders, but it's only appropriate if you're making drip, french press, etc. It doesn't really grind fine enough for our Moka-pot style stovetop. My mind boggles at the thought of what would happen if I tried to run this grind through a Silvia.
Pros: cheap, probably easy to clean Cons: grind not fine enought
It's a good value for the money, though--definitely worth the extra few bucks over a blade grinder. Just make sure your expectations aren't too high.