Creating virtual machines with ubuntu

When you have ubuntu as the main operating system, you have several ways of creating virtual machines for testing:
KVM (free and built into ubuntu)

• VMWare player (free player)
• VirtualBox from Sun (now Oracle)

I have used all three and it appears to me that (amazingly) VMWare player is the best of the bunch. WHY?

• Quicker boot
• Snappier screen response
• Better support for USB devices
• Allows cut-and-paste operations between ubuntu desktop and the virtual machine
• Nice user interface for managing the virtual machine parameters
• Easier transfer of virtual machines to Windows Hosts (i.e. your colleagues)
  

My tests were with jaunty and karmic. Maybe meerkat has improved things...