As always this app is a must have for anyone that wants to rip around corners like your car is on rails, and thats any car, not just the high end X types. The base tune you set up actually makes every cars handling characteristics feel almost identical. Without this app some cars are really twitchy and break into spin super easily, apply the base time to that car and you instantly feel like you can do whatever you want with it and will always have it right on the edge of breaking loose, but never crossing the line.