If you don't have an iPad or at least something the size of a Fire, stay away. Its extremely painful to read on the iPhone screen! The digital copy are basically scanned copies of the print version using the same layout. That may work for the A4 print size but is painful to read on the iPhone. There are so many other ways to consume content on the iPhone designed for the screen size of the iPhone.
Also the kindle digital copy will only work with iPhone, iPad, and Fire. Go to Road & Track's website you'll find the Zinio version that can deployed to your portable and PC and Mac which is much more useful for the same price!
As for the magazine itself, its typical of US magazine that profits from ads instead of magazine sales, so compare to Japanese mags this mag is thin and full of ads. Of course this topic is another ball of wax.
However kudos to Amazon for providing 14-day trial for me to find this out and cancel with no cost. Amazon always comes through for the consumer again!