Experiences with hydraulic rim brakes

[Darragh]

Hi,

I just wanted to ask about people's experience using hydraulic rim brakes. I've never used them myself, but I was checking out some of VSF Fahrradmanufaktur expedition bikes and they seem to use them http://www.fahrradmanufaktur.de/?page_id=3585

My main question is how easy is it to fix or find a replacement for them if you are in say South America or Asia, I would imagine they are not so common? Do they use the same mounts as cantilever or V brakes and is it possible to fit these if there is a problem?

Thanks,

Darragh