Very few would consider an auto "better" than a standard reel, but they are a heck of a lot of fun and can be "better" for some uses in some circumstances.
The search function will turn up a lot about their uses and operation. For example:
viewtopic.php?f=4&t=62758&start=50&hilit=crappiematicviewtopic.php?f=4&t=54310&p=248282&hilit=OSHA#p248282Basically, they are spring wound upon stripping line and also by rotating a component of the spring housing. A lever releases the spring to retrieve line. Somewhere on the reel is a release catch that relaxes the spring without retrieving line. This is important not just for after-fishing storage, but to prevent line, leader, and fly from zipping back through the tip top--not good with or without a fish attached.
String up the rod, extending about tiptop-to-grip or hookkeeper length. Now use the release latch to remove tension from the spring. Subsequently when line is stripped, the spring will rewind but will relax completely upon retrieve, ending with the fly and leader about that same distance.