Works great and it's open source (unlike VirtualBox and other virtual machines). Qemu-KVM is a great privacy and security choice.
Powerful virtualisation solution, especially when used with VGA passthrough; unfortunately the documentation is a mess. Good alternative to Xen, except lack of proper management tools. 2.5 years later the documentation is still a mess! qemu 2.11 got many more features, but many are undocumented. Even the included file:///usr/share/doc/qemu-system-common/qemu-doc.html file is full of outdated info. Remember, undocumented feature = bug.
It's ok but needs work on 3D to catch up with Wmware and VirtualBox
Not bad, the virtaulization with VirtualBox is better, 3D support.
Best virtualization software for Linux period. Much better than VirtualBox
best debug tool for linux kernel