It's all custom, and it's not particularly user friendly as you have to understand what to change to get a certain result. Most of the ford parameters are written in engineering lingo rather than english. You need to have a very good understanding of what the engine sensors do, how they relate to eachother, how EFI works, and a mastery of the combustion cycle. If you don't have the basics it will be tough but you would certainly learn a lot about modern engine management.
It allows you to tweak and change a multitude of things and that is a double edged sword, because until you really learn it there is a lot of stuff to mess with and it can be tough to get the results you want. Once you get it dialed in you have a vehicle that drives better than stock in every environment, gets better mileage and makes more power. For me it's fun to tweak and tune on things, especially if i don't feel like getting dirty. There was also an economical side to it, paying for tunes for every vehicle was getting old - now I can write my own for mine or my friends and play with them until the end of time at the one time cost of tuning credits.
The ability to datalog a vehicle makes diagnosis a snap. I can tell exactly what is wrong with an engine or trans in just a few minutes of driving it around without even popping the hood. Even stuff that is intermittent is reasonably easy to find.
There is no plug and play, you can grab tunes from the repository that other people have written and adapt their info, and it may work great, or it may not. You need to be able to filter through and understand what is going on well enough to make sure whatever you adopt from another tune is safe for your configuration. It is well supported, the 6.2l uses the same ECM family as the mustangs so there is plenty of people working with it.
Summary: It is hardcore gearhead stuff, and easy to get frustrated with... you have to commit to it. But it is an awesome tool once mastered.
