I have it and it's a unique piece of gear. I got it when I thought I would do my mastering piece by piece. I decided to stick with Ozone and upgraded to 5, so I'm not using it. However, couldn't this also double as a limiter to bring up a particularly quiet track since it's designed to increase loudness without losing definition or loudness?
Also, one of the nice features that I wish were in other pieces of gear is the audio leveling. There's a button to that will auto-level the output to match the input, so you can hear the effect on the music without the bias of hearing it louder. When you are satisfied, click the switch for the output boost - great feature!