I welcome E-cores. I have tested them by USING them myself and cutting each and every one of them open. Not by making ignorant claims on what could happen while using them. They have a thicker outter can than most, they have lots of media, and they are constructed fairly well. Yes I know they do not have metal end caps, whatever. As long as those end caps never fail ( and they havent with me) I see NO problem running them. For the price you pay for a ST you get a quality 5-7k OCI filter. That is bang for your buck.