Testing

1.- Aster

The best software I've tested to date (March 2016).
By supporting Windows Aero, SoftXpand does not support it, the desktop is nice and not noticeable being in a multi-user system.
Some games got problem using the same graphics card, one of them dont run. This time did not have a second graphics card for testing.

2.- SoftXpand Duo Pro

Works well, simple, good aesthetics.
Well in games, no problem playing two at once Dragon Age Origin, Dragon Age II, Tomb Raider, Bioshock Infinite. (2x nVidia GTX 580)
It lets say who owns each connecting USB memory which can be a nuisance for the first time assigns automatically and make administrative permissions needed to change.
Does not support USB graphics card so that you can not use a laptop for more than two positions if they want.