I usually just use Delta 100 for casual snapshots of family and friends, and so I've never really done any tests on it in D-23. But visually I've always been satisfied with the restults. Next time I make up a fresh batch I'll run a few film tests in it and see what I get when varying times. The thing I like about this developer is that it lasts so long. The brew I used last night was a month old and had 10 rolls through it, and it came out great...well at least the negatives look great...i'll try printing them this weekend. I think the capcity of the first bath is something like 20 rolls, but I only do 10-15 and then toss it.