dude, that JacksonRacing one looks whack and it doesn't give you access to your fuel.
if i'm having my car dynoed and tunned you better bet that i want access to controlling as much variables as possible. i don't want to just turn a knob and hope it adjust the fuel correctly. also, how will it work on a chipped ECU?
personally i'm going to get a apex vafc controller once i've acquired all my other parts for my car. a lot of people use it and i haven't really heard complaints about it.
LUDECONDUCT, i'm not bashing on you or anything like. i'm just making a general statement.