I've been using a 1954 Agfa Isolette iii for a few months, same vintage as myself. I've posted a user report on my website to say why I think these old folders are a perfect carry around camera for dedicated film users. In a nutshell, these cameras are small,light, unobtrusive and pack a huge punch in image quality. Agfa are but just one of those iconic camera manufacturers from the pre-slr days of the 1950's and earlier and there are many other old cameras that are equally viable today.
Link to my user report here: http://www.uklandscapephotographer.com/agfa-isolette-111/