I cannot say from personal experience but having researched the crap out of all tuners recently, it seems 80% of folks are going with the SCT3. $250 is a good deal but for lil over a hundred more, I'd get the best....
The closest tuner i have sells the both, but he seems to show off the Xcal charts a little more. I did the math,. here is how it works out...What would you guys do...?
OPTION #1
Predator=$250
CL racer= $269 (brenspeed)
Custom Tune= $125
--------------------------- total $644ish (doesn't include shipping)