Hello, yes I have a bakfiets style cargo bike and love it!

*Photo makes it look small. In real life it's enormous.*
It's actually a cheaper chinese made bike imported to Australia by Tim from cargocycles.com.au. These are simply brilliant bikes. They are however definitely designed for use in the flatter parts of the world but you said your part's flat so you shouldn't have any problems. Also I believe your bike will be equipped with Shimano internal gears which I would prefer over the Sturmey Archer hub that my bike has. Yours will be much easy to gear down if needed. I'm currently looking into various options to make things a bit easier - where I live even the bike paths are hilly.
Anyway, hope you enjoy your new incredibly heavy and beautiful bike! And don't forget to post some photos if possible.