DF and Stardock get along wonderfully. And DF does a LOT more than just manage monitors and taskbars.
It uses the WB skin you have applied. It can manage your logon screen, it can manage your screensaver. (multi monitor screensaves rock, btw.)
You can span a wall over all monitors, or just a diffeent one on each, or even duplicate walls one each.
Check out their site for more info. It does hundreds of things, all with the ability to be used or not.
I'm running 5 monitors, btw. With no problems with Stardock stuff except for WinFX doesn't apply to the monitors attached to my second graphics card.