I just got done performing several virtual labs here at EMCWorld and they are great. I have been hearing about all this new technology: VPlex, VBlock, VNX, UIM, and so on, but havnt had a chance to try any hands-on activities to feel the technology.
I just provisioned storage across the country, deployed enterprise level VMware services, and tiered multiple levels of storage within the span of an hour. I will be heading back this afternoon for some SRDF, FAST-VP, and Isolon labs.
My next hope is that they can do something similar to http://www.microsoft.com/events/vlabs/default.mspx so they are available all year long