I have and use the Yankee tank, so I can't comment on the others. My only comment is that it uses a LOT of chemistry, so I always try to have all 12 slots filled to make the most of it. I haven't noticed any poor quality issues though(yet).

Jdef told me another option that I'm anxious to try though, and that is development by inspection. He uses a very small green light on a footswitch. He developes the negs in a tray, and when he reaches the development time he flips the light on and inspects the neg. If the highlights are there, then he's done. I'm going to try this method using a Kodah No. 13 filter that I just got for panolure printing. I like the idea, we'll see how it works. Did I get that right Jdef?