"The downside of the machine is that Hyper V disables all power management functionality like sleep mode or hibernation. Booting takes a couple of minutes. How long exactly depends how many virtual machines are booted at startup."
Something to consider when considering Hyper V on a laptop. Might be a better idea to run VirtualPC/VirtualBox for your virtual machines if you want suspend-to-ram or suspend-to-disk for your laptop. Haven't looked into this myself though.