Regarding the Ilford 500 control panel, what would you say was lacking? What do you really consider a benefit from using the RHstopClock 500?
Well, my controller wasn't working properly, so a replacement was welcome. But, I love the split grade feature, working in f-stops instead of seconds, the footswitch, automatic test strips, auto drydown compensation, the ability to program in burns and dodges - plus all the other cool features. None of it is really "necessary," but it does make me more productive in the darkroom. Take a look at the website and some of the videos and you'll see what I mean.