I have been reading a lot about the SCT-SF3 tuners. I have a 2010 GT500. Do you think it is worth buying. Or are there better devices or alternatives.

 

it is not so much the tuner but who puts the tunes on it. I bought Brenspeed's Stage 2 package and it put close to 550 rwhp a damn big jump in performance from stock...and it cost 1200.00...hell of a deal for 120 hp! My advice is if you are going to tune it...get the most out of it.