My wife drives the car 99% of the time so an email tune was good enough for the 1% I drive it. I am stuck in the minivan because I work 50 miles from the house vs her 6 and I also use it for work sometimes.I made a conservative 450hp with a tune only 17' 3.5 F150. Its getting retuned come spring with e30. Its tuned by a local guy whom is a former mechanical engineer, now he just tunes full time. This guy writes his own programs to piggy back onto what ever tuner he is using, in my case he used HP tuners so he can tune the trans as well. Super Super smart guy. He does a lot of work for the local ford dealerships when they cant figure something out. They can see how many times its been flashed, then compare it to their systems. He was very informative and showed me comparisons of previous mail order tunes I had Vs. his tune. He also showed me as well that the "stock" tune that was assigned to your vehicle may not be the one that was returned to your vehicle via your tuning device. For instance, he said there was around 17 different stock tunes for the 17 3.5 F150, Well the one that was stored on my device wasn't the one that originated from my trucks computer. So he remapped it back to the correct one.