I've deployed this at a couple of different places. It always comes down to cost and the ability to still adhere to your ITSM-type standards. I've benchmarked a lot of virtualization solutions, and RHEV is the fastest – it has the least amount of overhead. And it's cheap too.

Red Hat Enterprise has provided the flexible platform on which we can build the solution we envisioned of hosting multiple applications in a single host.  

It has the possibility to OEM and create a great product with Ovirt as the main component.