I have a problem with this. Whenever I'm holding something with my cursor (aka "dragging"), the window changer (Alt+Tab) refuses to open, otherwise it works pretty well.
I am able to do this with GNOME3 and I was also able to do so in XFCE when I had GNOME installed...
The thing is that I don't want to have GNOME in my system just to have this very very useful feature.
I can provide more details if you want