The 100 sheet boxes is one of the reasons I have not yet tried Azo - it's far too many sheets to buy for trying. Now, if he had packs of 25 I would give it a go...

What needs careful testing is how to manipulate the contrast to fit existing negatives, not how to make a negative to fit a given paper. I have given up on multicontrast paper, after finding that I have much better control of tonality using graded papers. And the Bergger Contact is one of the most flexible papers I have tried.