I love the clear CE2s. They don't have any of that funky "fiber fill" taste & they don't get burnt tasting after using them a few times like some regular cartos do. I have had the usual problems with the tubes cracking and sometimes slipping right off, but I've never had one just stop working as a result. I just flip the tube or replace it with a section of syringe & keep on vaping! This being said, I believe they are meant to be disposable, so if one would just happen to quit working, I'd move on to the next and hope it lasts through quite a few fills. I'm all stocked up now, but when I'm down to my last pack, I'll be ordering more. I'm definitely not going back to regular cartos again.