The 159mm is apparently the least reliable of the Contax line, although a nice working example would be tempting. The 167 is certainly an oddity in handling and setting compared with the rest of the range, but is not really difficult to learn, it is certainly a lot simpler than even the simplest digital slr. The Aria is a lightweight camera, but the body and a couple of lenses makes a nice easy on the shoulder combination, when gear has to be carried any distance.