I happen to have both but I noticed that BR spends way more time on it and Ek is more of a summary. I did well in orgo and am wondering if the extra chapters are really going to make a difference given that there is LESS orgo on the MCAT. I guess I'm just trying to use my time wisely. I have the 1001 orgo too so if I don't do the BR then I'll just practice more with EK.