"You can now attach USB devices to Windows XP Mode applications directly from the Windows 7 task-bar. This means your USB devices, such as printers and flash drives, are available to applications running in Windows XP Mode, without the need to go into full screen mode."
That will be the "Plus Factor" here since I can launch the SUN Portable Virtual Box while in the XP mode!
For removal of the beta we found out earlier the only listing was the XP mode beta version in the Programs+Features section of the Control Panel to the beta version of the VPC removed as well. Between each step of removal and installation of VPC RC which much go on first! That's a must have where you then restart the system before running the XP mode installer.
Once that is done and you go to launch the XP mode the first step will be creating the new virtual hard disk in case any backup of the beta's vhd fails to load. I'll be looking into that more once the downloads are complete and the betas are removed to see existing vhds will still work on the RCs.
The option to decide where you want the new vhd stored is certainly a plus there! You won't have to dig into the "C:\users\user name\AppData\local\Microssoft\Windows Virtual PC\Virtual Machines" sub folder in order to locate the vhds and backups created!