i concur with snekkalapudi.
i had occasion to recover 36 virtual machines from the emergency restore in v5.5 from 2 VDP appliances with great success.
the restores are very fast and i ran 3 concurrently, had them all back in about 6 hours.
one thing to be aware of is that emergency restore happens on the same host as the VDP appliance is running and that host cannot be managed by a VC, you have to tell the host to forget about the vc while the restores are in progress.
afterwards i found that all 2008 and higher windows servers needed to be rejoined to the domain and they all wanted their licenses renewed, need to follow up on why but that is what happened.
all-in-all very please with the product.