The reason for me is that I can get CN film with 200 or 400 ASA for next to nothing, while BW film is much more expensive. My scanner works very well with the flat negatives I get. You have to like grain when you do this!
I do it so:
1) Prewash the film for three minutes in warm water
2) Rodinal 1+50
3) Developing time 17min. First 30 sec agitation, then two tilts after each minute
4) No stop bath, just water
5) Fixer
6) Wash; "Ilford" method, extended (5x, 10x, 20x, 40x)
7) Tetenal Mirasol for 30 sec
8) Strip off the Mirasol bath with the fingers
9) Dry
10) After drying I roll the film reversed for some hours to remove the twist and get flat negatives
11) Scanning with Canoscan 8400F @3200dpi
To my surprise not so much postprocessing than I thought is necessary .
All I posted in my blog in the last two months are done with this method.