I think people should be a bit careful here. I don't know for sure because I haven't investigated it but I believe there is a difference between virtual machines and virtualization.
AFIK virtual machines use the host operating system to run a copy of another OS which has limitations such as native hardware driver support while virtualization means that the CPU is capable of handling a guest OS and its hardware driver requirements as well as running the host OS and its hardware driver requirements at the same time.
Simply put, a virtual machine is not likely able to run the drivers necessary to use all the host hardware efficiently and quickly while a virtualized OS is able to use the host hardware efficiently. There are other limitations but I think you will find that this limitaion (VM NOT ABLE to run most hardware while Virtualization IS ABLE to) is perhaps the most defining one.
Perhaps someone else might clarify this for us as I'm not up to that task at the moment. At any rate, I don't think most of us need to worry about this. The PC Mag article suggests only large and medium business would be the ones needing to be concerned about this it.
