If you are testing/using a 'private cloud', what are you testing? Why that? What is your setup like?

What do feel is missing from the cloud provider you are using, or the "private cloud market"?

I've been using CloudStack for about 6 months, and for my situation, it's the perfect fit. I know that there isn't a one-size-fits-all for anything, so that's why I wanted to start this discussion - to see what others are doing. I know Dell has a lot invested in OpenStack, but I wonder if they are missing out by focusing on just one private cloud provider.