As our business has grown we've needed to scale up quickly without having too much impact of IT resources with this problem zipcloud was able to help us do just that! They have been very responsive in their support as well which makes them stand out for me when I think about providers who offer cloud services.
We're solving some problems around file storage but also looking at other ways they could provide additional value like email archive etc - not sure yet what those will look liked though so cant comment here really until it's more clear how things are going to evolve.