I've been thinking of trying these for some semi-thick juices. But I'll say, Boba's Bounty, I usually punch (3) 2mm holes myself and still have to take a primer puff every now and then. For really thick juices, I don't think those small holes will do the trick, even if there are 3 of them.
Ya...that is my worry. But I would really love to be able to buy pre-punched cartos that will work with all of my Virgin Vapor juices since I only vape 100% VG. Supposedly, they are bigger holes than previously. I like the idea of have a clean factory punch so that there is no deforming of the carto, or chances of metal shavings/dust from a dremel.