I did some C-41 processing a couple of weeks ago - got through two rolls of 35mm, about eight of 120 and half a dozen sheets of 4x5. By chance I had two very similar exposures of 4x5 so I had one sheet done by a good quality dip and dunk pro lab as a reference for my processing. As can be seen they are close enough to identical. The processing was simple enough, although a bit frantic with the primitive method of temperature stability (hot water in a 20 liter tank.) Looks like I'll be teaming up with a friend to split the cost of a 5L Jobo liquid kit for the next phase.