Cargo Bikes

Anybody have any experience with Muli Bikes from Germany?
They look like a lot of fun!

I actually saw one of those in Berlin today.. stopped, had a look at it - and then found the owner (who was waiting for their food in front of a eatery) and had a little chat with them - and he was so kind and asked whether I wanted to ride it up and down the street!
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It was kinda heavy-loaded, plus the bike itself is rather heavy as mentioned before.. combined with the small size it made balancing more difficult than expected (keep in mind I'm not a trained cargo driver, but found it definitely harder than driving a Bullit for example).

Was a bit disappointed really.
It's not as fun to ride as you might think; guess due to a combination of long wheelbase like a Bullit but load not being as close to the ground, and weight in relation to overall size.