I have one from cydia, is really bright, and it can be adjusted from steady to blinking lol.
I tested the dynolicius app, well not completely but I monitor my braking, acceleration and lateral force with it, I don't have any real data to compare, but the numbers seem to be realistic, I got 1.2 G's when braking hard, I got a lateral force of 0.72 G but I still need to go somewhere where I can drive around without compromising my car of my health lol, I didn't push the car to much, for acceleration I got a 0.32 G

I think that would be consistent with my auto ST.
I haven't done any 1/4 mile or 0-60 run to see what would come up.