I have one!
Can't recommend it highly enough - no more disgusting maggoty biotonne for me
I was worried about the law here and decided to get mine in the uk and just not mention to anyone here, which has worked fine so far. Husband and mate installed it for me, and have had no problems at all with it.
Was actually looking at kitchens the other day in a posh kitchen shop and they had them for sale, so I guess it is allowed.
Interestingly enough though, whenever the topic comes up with most Germans I know, they all think it's disgusting and Umweltunfreundlich