Next to a knowledgeable in-car driving instructor, Mike Valentine's G-Analyst
is quite possibly the best driving instructional aid ever produced.
The wealth of information imparted by it's 8-second trace,
tells you more about your ability to use the outside edges of the friction circle
than any seat-of-the-pants impression can give you. I
have learned more about my driving from this device than any other product....buy one, if you can!