There were very few errors that I could find. If or when I ever did, it was pretty easy to cross out or add to it. I could pretty much use just Chung to do or answer almost anything I needed to know. Before every practical and written we would all pull out the Chungs and walk around the lab. It was wonderful. A very concise and yet detailed book. Your prof probably just doesnt want you saving time or something... I don't know. I tutored the class below me, and everyone did great using Chung. Also, Chung is WAY TOO DETAILED to even think about using for Step 1. It really is excellent for the class itself, but it has sooooo much info, that it would be crazy to try to fit it in for boards. I used High Yield Anatomy for boards, and even that was a bit of an overkill - it was a good 2 day read tho.
Take Care