I agree that these trays are very cool. So much easier for 8x10 than the BTZS tubes if you don't have a darkroom (i.e. you don't keep having to go back into a tent to swap caps). I've used these regularly for B&W without fault. I'm about to be brave, buy some colour film, and try to use them to get back into colour processing. I'll probably set up my Jobo for heated water bath at least for E6 and for multiple sheets in one session: I entirely understand the point about the thermal profile of the tanks meaning that colour processing is possible, but you still do need to keep the chemistry at the right temperature - I'm planning to try out the new Bellini kits for E6 and C41 available here, which have had rave reviews.