None whatsoever.
I have a Tupperware with ~5 inches of water at temperature, sitting on a now unused waterbed heater set as close as possible to the temperature I need to maintain. Tubes are always done in 'pairs' but if only the one sheet is being developed there is ALWAYS an empty 'dummy' (with water) to make a 'pair'. Most often I'm doing them as two 'pairs'. Around each full minute mark, one of each of the tube 'pairs' are moved from left to right such that the rotational direction is changed as close to the 60 second mark as I can get.
Before getting 'started' I have spare (or... extra set of 'tops'... or caps, if you must) with rapid fixer fix, set at the REAR OF THE 'tub'... (this way I know where my hands can 'find' them with really having to look... and they are much less likely to be knocked over by accident when in the dark).
Approaching the end of the development time, I turn off the room light, dump the developer into a beaker (at the 'side' of the tub) and immediately submerse the tubes (still with the film in place) into the water bath (i.e. NO acid stop-bath) for a bit of 'rinsing' and quickly 'grab' a top from the rear of the tub and... with the tube (plus film) upside down... screw the TUBE into CAP until all "pairs" are 'capped'... I then grab either two or three in each hand and give them some good but gentle 'shaking' and drop them into the water-bath for rotation for the allotted fixing time. I do not worry about saving the once-used stop bath for later use.
The Fixer is then either added to a jug that I have marked "PART-USED FIXER" and the tubes are put into the water bath for a quick 'rinse' and a soak until I can grab the appropriate number of Kodak film hangers.. insert the film and put all into a tank that will sit (for a few minutes) with a light flow of water until I get the 'wash-aid' into anther tank for fixer removal /deletion and ten into a final washing water tank. The part-used Fixer is regularly 'checked' for efficacy' before use.
I usually do just the 'one' developing session per tub of water... ie each 'batch of film gets used only once... but there has been the occasional 'two bath' runs when I'm in a bit of a rush or when She Who Must Be Obeyed needs sometimes/usually super-cedes mine....... 8-(
It may sound somewhat 'complicated'... but that is the way I 'fell' into.... I don't know how others do it... but you should/could get into the 'rythm' quite easily. If I were 'just curious' I would first invest in "just the tubes.. with extra caps". before purchasing the whole system.
Ken
PPS.....With my 8x10" tubes I only 'do' two tubes at a time... but my 'technique' is the same for both film sizes.... but having done it this way for about 11/12 years.. I would have a hard time going 'back' to hangers... or trays for 'regular' development
If you have never tried a pyrocatechin based developer, this might be the time to 'kill two birds with the one stone', Yes... I have quite a few of the small containers (500ml?) of HC110, packets of D76.. some packages of powdered Ilford 'stuff' that is about to leave for the local camera club membership who have not gone fully digital... yet?.