i currently have a diablo custom-tuned delta flip chip installed in my car. that was 9/03 (a year ago). i've had a few new additions since then and plan on doing the ported eaton mod soon. if i can change my current custom tune doing some minor editing, i could sell my flip chip on ebay and save money in the future if i need more minor tuning.
i know handheld tuners generally suck, but since i just need to slightly modify my custom tune, i feel it should work for my needs.
I got mine from rpmoutlet and i regret it. Even though its more $ i'd get mine from James at RWTD or another vendor that offers free custom tunes. Plus if you run into a problem with your predator rpmoutlet will not take a return even though diablo says there is a 30 day money back guarantee. Just FYI.
I really want to get one in my opinion it's well worth it. Jaysvt has one tuned by rick@amazon and he put down a little over 500rwhp with the basic apten,2.76,exhaust, filter. You can data log runs, pull codes, make adjustments to your tune (minor). It has a lot of functions that a chip doesn't for almost the same price if not cheaper.