As Sandy said, read the threads on the AZO forum, all the information is contained therein. I develop using BTZS-type tubes and minimal agitation with Efke PL100 8x10 inch film and Pyrocat HD diluted 1:1:120 - it is all I use and I have yet to have a single mark or scratch or whatever other artifact you can imagine. I am confident enough in my development procedures that I no longer expose for back up negatives. One scene - one shot! My negatives are extremely sharp (thanks to edge effects - the AZO forum has in depth discussions about this phenomenon), exhibits wonderful overall contrast, BUT MORE IMPORTANTLY, beautiful local contrast - it is this local or micro contrast which greatly contributes to a print's feeling of light (or glow, if you like) and three-dimensionality.