Look at me replying to all these ancient topics. I should come here more often. Yes, we are using **exactly** CentOS. We just can't call it that. Everything's the same, not even recompiled. Kernel, Modules, packages, everything. The only thing we've had to recompile is anything that has 'CentOS' or 'Redhat' in it, and replace it.
*shrug*. What can ya do.