Although the emulation / virtualization market already grew larger with more and more options available today, QEMU was (and still is) one of the most awesome projects out there.
I let them go first, and watched through an instrumented terminal how they clumsily installed a rootkit, then inevitably refused to give anything in return and laughed calling me a noob.
Their laughter was short lived.
I had even spent quite a bit of effort kludging the kernel to report much higher specs than Bochs could deliver, but all that effort was wasted because no one knew how to check.
I've only seen Vmware (gsx/esx) at Windows shops for things like big Exchange clusters, etc. Every CDN I've worked at used qemu.