My last batch of the new ce3's has been problematic, I've had an entire 1ml leak from several. It's not operator, I've been using the ce3's since they came out, and I use the same liquids, too. I wasn't overjoyed with losing some volume with the new ce3's initially, but just this last batch seems to have been a quality control issue, perhaps. I order ce3's with every order, but I'm going to start ordering my XL blanks again, to be on the safe side and not find myself doing without. My 78's are my preferred mechanic at the moment, but I will still use XL cartos on both 78's and my X2's.