The ER and the IR are totally different experiences for me. The IR gives that euphoria feeling and the ER just does its job on the pain. There is a feeling but nothing like the old O*cees. My understanding is the goal of the new coated pills is to eliminate the euphoria type feeling and also make it incredibly difficult to ingest in any way but oral. I find that I look forward to my IRs just to get that feeling. I also LOVE it because it really helps my breakthrough pain.I have a theory that maybe I can slow down tolerance with the ER. I don't mind waiting a couple hours, and if just *maybe* my tolerance would not build so fast, it would definitely be worth it. Just a thought. My tolerance skyrockets with the IR...