The core storage for the enterprise front-ended by vmware esxi running the very lastest of Microsoft domain services and Exchange along with 100 virtual desktops. At the time using gigabit links with procurve switches.
I have to say even the EqualLogic stuff is better however PowerVaults are well worth the money.
PowerVault is good for direct attached solutions such as video security, backups and tape storage. We had it as our VMWare storage but dropped it about 5 years because of lack of compatibility with VMWare. I believe it is compatible now, but I still wouldn't recommend it for large enterprise environments.
We have the PowerVault deployed in 3 different locations. We use it internally for corporate infrastructure as well as dedicated to clients. It serves as both primary data storage as well as back up storage for some clients.
Pure Storage is much better overall. If you need to have a 7.2K solution or an array where you have several speeds needed (7K, 10K, or SSD) then Powervault is good. It is also much cheaper than Pure Storage.