It's brilliant!
Gone is the lethargic, soggy, drop your foot half way down to get it moving - wondering when it will respond.
There are three settings with red being a bit too hyper and green feeling just right. If you've looked into it and wondered if it's worth the money ($300 as I recall), try it out, it absolutely transforms throttle response in D to be even sharper than DS mode. Quicker engine response also seems to send quicker messages to the transmission so it punches out of turns a lot more sprightly.
