Okay the ones I got from COV seem to work fine, if not spectacular. But I am hearing there is a CE3 coming out soon. Even though it says CE2 FINAL R4 on the royalsmokers website. They are NAUGHTY. I am also hearing that your Chinese website that will sell only blocks of 100 have sometimes been shipping people older versions of the cartomizer. Too late for me, as I ordered due to lack of response here, my fault for not listening. I will also be dissecting one that I got from COV to see if it's indeed the latest version once I'm done vaping the liquid in it. There must be temptation for some vendors to sell older versions under the latest version banner.