I recall teaching a photo course to younger kids in Boston in the early 1970's using Dianas and Polaroid Swingers. Simplicity in photography, forcing them to concentrate on the subject and minimize extraneous subject matter (you couldn't decipher it anyway!). I think the Dianas have a dual appeal - the five stop exposure range was pretty high tech for a box camera and the durn things are just so ugly that they have become "cute" in retrospect.