It's hard to describe what it is about Super Sprint that feels so great, but there's something about the way the car controls that I just find wonderful. Finding an original arcade cabinet lurking somewhere was always a huge treat, with its set of steering wheels and pedals. Most of the time I had to content myself with the home computer versions though, but that was fine because they were pretty much spot-on (on the ST and Amiga at any rate). The controls also translated nicely to a keyboard, so while the thrill of spinning the wheel around and steeping on the gas was lost at least the feel of the car was intact.
The sequel - Championship Sprint - added a new dimension with upgrading the car between races and additional hazards and track features, but I've always kind of preferred the simplicity of the original.