Very easy to use. Just follow the directions. Received the BullyDog BDX one evening and had my truck programmed the same evening. There are several settings. I only chose a couple to begin with, but noticed the extra power immediately. Ibis will it set in economy right now, but I haven't noticed a tremendous increase in mpg yet. I mainly got it for towing my camper which is 37' bumper pull and weighs 8800 pounds in the dry. So far, I am very pleased with the BDX.
2014 F150 FX4
I have had the tuner now for a couple weeks and it has impressed me so far. I have only used it on the 87 octane and I'd just Ed for my bigger tires, but it has gave me better throttle response, power, and increased my gas by 2 mores mpg. I plan on running 91 octane and using the tune for it in a couple weeks and hope it does even more.