It actually is simple...
It actually IS simple, just that little light and the little timer. Not really fancy, either. I just wanted to show it since there have been some recent threads about how to proceed with the RH Designs model, including one thread discussing how to keep a consistent height during flashing.
The way it's set up with the flex arm, I can keep it at a consistent height from the flashed paper, you see, which I can't do if I attach the flasher to the stage of my enlarger. I can also swing it out of the way quite readily.
I don't have the space for another enlarger (nor would I care to invest in one for this sole purpose), so this is really the cat's arse for me. Also, if my I may gently suggest, another enlarger or a light box and lens do qualify as "more equipment" as well
. But I'm sure you're correct that they do work fine.
Cheers from big-snow Ottawa!