I got the diablo tuner for my GTO.
I figured it was worth it since I was going to use every single one of its features:
High octane tune
Real time diag's
Skip shift elimination
was it worth it???
well, I know that I use 2nd gear alot more now that skip shift is gone!!!
(I would recommend everyone get rid of skip shift regardless of how you disable it... I didn't realize how much it really changed my driving habits until it wasn't there any more...
RWHP increase?? I didn't notice anything huge... but I don't even have 2K miles on the GTO so the thing is hardly broken in yet anyway..
Programmers definately work though, don't get me wrong.
I bought a superchips programmer for my truck and it made a HUGE difference!
its a 2003 Dodge Ram 1500 Quad Cab Short Bed (with a HEMI of course) and it has about 30K miles on it and WOW it wakes that thing right up!!
Overall I am happy with my purchase... so far its the only "performance mod" I have on the car.. I haven't done intake or anything.. I'm sure the tune will increase in effectiveness as I hit stage 1 & 2 mods.