Haven't used it, doesn't seem like anything I'd want to use.
It promises to be an 'awesome button' and they almost never work.
Essentially it takes away the things I want EXACT control over (level of distortion, dynamics and stereo field) and puts them behind a giant knob.
"Make it big, yo"
If you want an all-in-one mastering tool you should look at something like Izotope Ozone. More expensive, but you get a lot of controls and you're pretty much set.