Got my GDE Eco-Tune flashed in from the programmer last night, aside from some issues with Vista and having to use an older laptop with XP, this is a fantastic product with incredible customer service from the vendor. Flash programmer works very well, and reads all factory codes, unlike the autozone scanner.
I havent had a chance to fully test it or assess fuel economy, but first impressions are:
1. Runs much smoother at idle and at load
2. Much less throttle needed to move, doesnt seem much quicker at 0 to 20 but very quick from 20 to 70 (and beyond up to a certain triple digit number I wont mention)
3. Seems to have less visible smoke under heavy load.
Cant believe I waited 60k to consider this product, I would recommend it to anyone and well worth the $500 after I return the tuner.