I just developed a roll of 35mm Delta 400 in PMK Pyro, using chemicals from Photographers' Formulary and their development times minus one minute for 35mm film. It produced the most beautiful (quality, not subject matter) 35mm prints I've ever made in 25 years in the darkroom. At 8X enlargement (35mm neg) the grain is scarcely noticeable, and is only slightly greater than in a print of the same subject taken on Delta 400 120 film (6x6), developed in Microphen and enlarged to 8x8 (whatever that enlargement ratio is.) In both cases the grain is there if you want to look for it, but the quality of the image is such that grain is not something that strikes you when you look at it.(posted 9579 days ago)Compared to Kodak developers that I've used over the years (Microdol, TMax, D-76 and Xtol) PMK is nastier stuff (wear rubber gloves, which I've never done with any other developer, and preferably get the liquid concentrate so you don't have to mix powders for which a properly graded dust mask is strongly recommended) and takes more work during development (agitation every 15 seconds, and save the used developer for reuse after the fix), but if the quality of my test rolls holds up in regular shooting it is well worth the effort.
Photographers' Formulary is at 800-922-5255 (mountain time zone) or http://www.montana.com/formulary/index/html. Their catalog offers some quite interesting-sounding chemicals for nearly all black and white and a few color darkroom processes. For now, I'm sticking to working out the PMK details for various films.