All of us vendors sell them for the same price, it's the customer service, what and how many tunes we send you with them that makes the difference. It will be the last tuner you buy.... guaranteed. As has been said about 100 extra hp at the rear tires is the limit for the stock trans and there are hundreds if not thousands of trucks that have EFI Live with a stock trans without problems. When/if you build your trans you load a bigger tune and go.
If you can wait for the AutoCal to be released it will be a cheaper alternative and will be custom EFI Live tunes for your truck loaded onto a handheld box by your tuner of choice. If you make changes you let us know and we email you updates to your tuning.