yeah if you can drop the $795 for the pro racer package and buy the wideband kit it is the way to go as long as you are going to do heads, cams, supercharger something that really require a retune.
It is kind of a waste of money if you are just doing a bolt on car though.
I am just getting the tunner and its right at like 400..And then slowly get other mods to go along with it like gears and all.. But right now i have a cat back and going to have a off road x-pipe and i done the airbox mod..