For a cheap way to try 6x9, I got an Agfa/Ansco Viking. The pictures are very sharp, and the exposures seemed to be spot on. However, with this brand you need to watch out for two things - the bellows might be shot, and the shutter lube may have turned into glue over the years. In my case, I lucked out. You do have to pay attention when using it; did you advance the film or did you not advance it? On the other hand, if you want to deliberately do a double exposure, it is so easy to do.