I'm quite happy with the results I'm getting from Pyrocat HD. I'm using a Jobo 3063 expert drum, which can handle at least 16x20 if not 20x24. Also, with the Jobo the fumes are minimal, whereas with 16x20 trays, you're dealing with a very large volume of chemistry with a very large surface area. My darkroom sink can barely handle three 16x20 trays, let alone the 16x20 washer. So it's a NO to trays.