I had a Green Cone in Brighton. It took meat, fish etc that normal composters don't, so was good for that.
Downsides:
you have to bury half of it in the ground - I was digging on stones with a hand trowel (!); you don't really get compost as such...most of the waste just turns liquid and drains away into the soil.

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~ What do I think of Western civilisation? I think it would be a very good idea ~ Gandhi