Pros: Easy to use, can forget about it, open on the bottom
Cons: sometimes hard to mix because the top is tapered
This was free because I attended a Warwick Township (Lancaster, Pennsylvania) composting workshop at the municipal building. It's very easy to use. It's big, and it's open on the bottom so ground works can get in all on their own and help you along. There is also a little door on the bottom for easy access to the stuff already composted. I call it Darth because it looks like Darth Vader.