In my post of 26 October 2013 I mentioned the various Jobo daylight-loading developing tanks for 35 mm that culminated in the Jobo 2400. These tanks work on an entirely different principle to the Rondinax 35 and clones. Some newer YouTube videos have appeared which describe how these tanks work. You can find them here and here.

The Jobo looks seems to me to be more fiddly to use than a Rondinax or Rondix.