GreenHAAS is pure awesomeness. It's a plugin that combines the basic audio 'theories' (delay, saturation, and so on ...) that every one uses when mixing in to one plugin. I really like that there's no numeric values on any of the settings. It allows one to concentrate on the music and not the science. It's been useful in a panoramic variety of situations, many more that originally expected. So simple, so effective, It's truly a must have plugin.