Some of my favorite uses:
Presence on vocals: turning the knob brings the voice up and forward, as much as you need. Small dose is transparent, large dose makes for a very modern vocal treatment that cuts thru the densest wall of sound.
Presence on sampled snare or hats: makes them crack, that sensation of being hit in the face. Follow up with generous slow attack fast release compression, gives it the right kind of attitude and aggression.
Sheen on VI synths: makes them sound more alive, sit easier in the mix. Makes sampled beats and drums snap.
Lift on bass: brings up all the harmonics in a unique way, gives the bass way more presence without eating up the low end real estate. Makes synth bass growl and buzz.
Open at o'clock, Presence at 3 o'clock, FF off: Anything you need to sit waaaayyy in the back of the mix.
Shimmer at 3 o'clock, FF off: pads and synths that buzz and float, zero weight, awesome ambience. Percussion that hovers on top of the mix.
That's just a few, there are no limits with this piece. On whole mixes it gives everything a polished feel, sounds expensive to me.
Gregory Scott - ubk