In my experience they are kind of hit or miss. Make sure you clean then before you use them because the primer that they use tastes gnarly. There are some issues with leaking so make sure you fill them as directed. Also I was having issues with them tasting burnt. I was told by SI that when they taste burnt you should take them off the battery, plug the hole on the battery end and take a quick draw on it to help the
juice wick better. That seems to have helped some. I just started using e-smart clearos from vapor kings and don't think I'll be using my CE3s much anymore