D23 two bath version and Stoeckler: what's the difference ? Automatic development system with automatic exposure system should give very good results for kids. Just teach them proper action with the trigger, so camera has a time to set everything for the shot. This Pentax is a perfect camera with great lens and light meter. Kids can learn many things with it and have always very printable negatives. This will increase the "fun" portion. You and I, we know, that for proper operating of fully manual camera some knowledge and understanding is needed. This could be introduced along the way and gradually. I don't see, how the kids could be hurt with this activities, but there is always a possibilities that they may try to club each other with the cameras, but that would be not the photography fault I guess.