I have not used the current C41 B&W films. However, back in the 80's I used XP1
extensively. I never had real problems with it, but most of the other
photographers I talked with did. Had a lab once comment that my XP1 negs were
the most consistant he had ever seen from the film. All I ever did was
experiment a bit when I first started using it and then did what seemed to work
best for me. I seem to remember that I had to use about 2 filter grades higher
contrast when printing than with conventional film. I even had some 16X prints
shot at 3200 that looked real good hanging on the wall.
--
graywolf
http://graywolfphoto.com
"You might as well accept people as they are,
you are not going to be able to change them anyway."