I find it funny that most of the zealous Race Logic supporters are non owners.
From a Race Logic owner: It is not all it's cracked up to be. The car can and will spin out from hard acceleration (yes, even at "0% slip"). Often times it takes too much power (yes, even at "20% slip"), and other times the launch control seems to get confused.
What this unit does is aid your driving-- not replace it. The unit gives me a little more confidence in driving. Just don't rely on it. I like the unit in my car but I'm not sure I'd buy another one.