I think Robbins is probably too specific for board review. There's a bunch of stuff in there I can't see us ever needing to know for Step 1, such as specific genes that cause conditions and their typical locations on chromosomes. That said, if you're willing to go through it and just ignore the questions that obviously are way too detailed, it'll be a great resource. I plan on using it, personally. WebPath is great, too, but seems to focus on just a couple of conditions in its questions sets. That is, you might get 3 questions that have to do with endometriosis out of the 40 on female GU. In short, I'd use both, but if you have to choose, I'd go with Robbins and a discerning eye for the WTF? questions.