I process several rolls of films of BW film each month using SS tanks and a water bath. I have been during this for more years than I would care to admit. My results are always consistant. All that is needed is a good thermometer. I don't like the rotary systems as they are constantly mixing oxygen into the developing solution and this can cause problems with dilute developers. Doing things by hand is not difficult. I would rather spend the money for a good lens than spend it on a processor.