It just seems logical to have a map made to your car, rather than a map made for every car to then be applied to your car, which is not the same as every other car!
Price up it up, Stage 1 is £290 at R-Tech and whatever your fuel costs will be, plus the peace of mind that your cars hardware is being used optimally...(priceless).
Just my thoughts - this is what I intend to do when I buy a GTI (looking at a 300 mile round trip, and you know the journey home will be worth it!!)