I've run across several posts indicating that people have used C-41 fixer for B&W. My understanding is that it is a rapid fix with a slightly acidic pH. I'm also considering Formulary TF-4, which I know has rave reviews, but I'm a little put off by the price (about 3X the cost of C-41 fixer).

Has anyone used C-41 fixer for B&W? What fixing times are you getting for film and paper? How does it compare to other rapid fixers in terms of wash times for FB papers?