If any plugin is going to make your head spin, make it this one.
As well as allowing you to adjust the 'spread' of the Haas effect, GreenHAAS is packed with numerous saturators and modulators, giving you the ability to inject life into a sterile mix and make your tracks blossom. Use just one of these functions or combine to taste.
For me, GreenHAAS is about having fun and experimenting. Open this plugin up, twist a few knobs, play with the GUI and see what it sounds like! If you're a mixing engineer, this plugin might inspire some new ideas. If you're a producer, it could warp a sound in a way you never thought was possible (or easy to accomplish).
Overall, if you're looking to save the planet, this plugin is not for you. But if you're looking for vibe, then look no further.