How good is the support? I ask because last time I tried HyperV I had lots of really lame issues. Like breaking the CD-ROM drive access and their workaround was to copy over an ISO and mount that locally or something like that. It felt like Linux was an unfinished offering. Yeah, I mean it ran... but not well. I figure some of what I ran into was user error since its a new tech to me but I've talked to a few people who have had serious HyperV issues so I'm not going to take all the blame.
I bring this up because I'd imagine those Linux VMs are sitting on top HyperV. I'll be very happy to hear that my fears are unfounded and they run great though.