It will be interesting to see how the flash and piggyback tunes come along for the F10 M5 and the result will likely be similar to how things stand in the N54 twin turbo scene which is each having their own strengths and weaknesses. The JB3 tune for the F10 M5 only costs around ~$300 (it is not listed on the BurgerTuning/BMS website yet) making it a great value.
That begs the question, why does the Switzer piggyback tune that with similar bolt on modifications put down 633 wheel horsepower on a Dynojet cost $2000 more than the BMS tune? Why? Because M5 owners generally have disposable income and don't know any better, that's why.
These two piggybacks are doing basically the exact same thing. BMS states their box is actually more advanced. They actually are even considering raising the price. It's crazy but what is even crazier is burning money for no reason. The dynographs below speak for themselves: