Although I was 2 for 2 coming into the level 3, using Schweser, it took me multiple writes to pass L3. Although Stalla and Schweser are both good notes, I only passed when I used CFAI material and supplemented it with the Stalla program - I probably put in 400+ hours, but it paid off. I found level 3 harder b/c of the written portion where none of the review providers offered anything to adequately prepare you for that.
i used stalla for all 3 levels and went 3 for 3. I thought they were real good, although the level 3 books were so so. Level 1 adn 2 were great.