I've bought 5pks of Boge LR laser punched cartos for my tank from a few different vendors and I found them to be very hit or miss. Some have lasted over a month and some had a burnt taste/tight draw from the first drag. I even recently opened a pack where 3/5 cartos wouldn't even thread on my 510 connections. I really like the carto tank for on the go vaping but these things have been a PITA. Tried Smok cartos and they were even worse. I'd get a diver if I could find one less than $60 shipped