Only took Eric's. But speaking to people who took EIM. They were not over the moon about it. Eric's was awesome!! He made all the info understandable and condensed it so you know what to focus on and what not to. He gives you all the current research on arch topic and not just ...here is the article .... He gives that but also all the important findings and what they mean.
I have 4 friends who are taking ocs this year and they keep asking me what to do and all I keep saying is ERIC WILSONS class. After I took his class I used no other study material AT ALL.