The only reason I'm given it 3, and not a full 5 -- it's actual integration with UAD. One has to click two-three times on edit button (Latest Cubase, 64-bit all-the-way) until you'll finally get plugin editor to the screen. It was like that in the first version, it is like that now. But plugin REALLY changes my world -- M/S rules :)
This is a great unit but suffers from cracks/pops/stutters when adjusting values in the eq section.
Having said that, this would still be used heavily in productions as the stereo width really has some voodoo going on in there - still makes me double take with elements affected with this unit - an absolute must have.