Workstation 8 (and IMO also 7) has a real bug, if the VM is running in full screen mode and the screen of hosting Windows 7 is locked it is impossible to unlock the screen (the mouse is attached to the hosting OS but keyboard remains at VM and so no password can be typed). I must always use RDP from another workstation to iconize the VM. For VMware player I would accept such bug but not for the not sheap Worstation variants.
Br, SW