it does crispen the engine response quite a bit. all it does is reprogram the EML (DBW throttle response to MAX).
CON'S: it's expensive if you pay retail.
i got the software installed hoping that it would negate some of the more irritating quirks of drive by wire throttle.
it works. i'm amazed. for once, something dinan says is outright true. if you can score a discount from your local dinan dealer, i would recommend it, or buy the JimConforti version when it comes out.