The ability to perform consolidation and it's portability, flexibility, and DR capability.
None that I can think of. It's a nicely-evolved product.
Overall, it’s very stable. I'm very impressed, except when running on Dell, but it works on Cisco blades.
It's very scalable, and you can add more as needs dictate. It depends on the ratio and goals for consolidation, so you can scale as you need.
The quality is not quite what it used to be since it was outsourced.
It’s now very easy, was harder but now more deployment options, scripts, auto-deploy, can have full automation or manual, smaller footprint.