Sounds interesting as i have no local RR so i want to try it.
I definately have to look for it in the app store for iphone 4 (and re-weight my car as i've lightened it further ).
Yes do, it is very nicely put together and the more people who start using it will give a better idea of what performance people cars have against the specs/parts that they are running. Obviously the human element may let it down a little but we all try our best!