Well, programming just about any computer can be rewarding, and, although certainly not always, is usually fun.Bah, I doo ann my fun programming on my Apple II. It's fun and rewarding too
In fact, if you put DOS and graphics aside, programming an Apple 1 is not so different from programming an Apple II. For BASIC, the limitations of the Apple 1 version may be somewhat bothersome, but for assembly, there's no real disadvantage.