So far, it looks like the luck of the draw with CE3s. Mine, at least the two I am using at the moment, are working fine. I did stop using the VG vanilla liquid in them, the popping and burning was getting out of hand and making a mess in the CE3 with burnt liquid residue. That liquid is quite thick and can't be drawn into a syringe thru the needle. I cleaned that CE3, had to use a dental pick to get the inner silicon seal out, but it did clean up and it's working fine with SI RY4 at the moment. It'll be a while before I use more of them since I want to test for lifespan, so I'm going to stick with the first two until they die. I will say cleaning them, getting the inner seal out, the center post/air tube out and then putting it back together is more difficult than cleaning a clearo, so I'll test liquids with clearos in the future and keep the CE3s for single flavor use.
Something I am wondering about is how many people are using them overall and what is the overall percentage of problems? More than one of us posting here has had excellent results with them, while others have had problems of one sort, or multiple sorts, or another. As a new product for SI, I think we should all expect some performance issues and rely on SI to do their thing with support and working things out. I hope SI gets as good support from their manufacturer as they provide to us if there are manufacturing problem. I know I was anxious to try them and would have been disappointed if I had experienced some of these problems, but patience will be the best tool in our arsenal.