I honestly still don't get all the problems people are having with DC's. I've slotted and punched them. The only lkeaking problem I ever had was the first few I tried slotting, I cut to deep. After that, a lighter touch did the trick. I have bought and used DC's from 4 vendors (I realize they are probably Smoktech) with no problems since the first couple. I have probably run through 25+ DC slotted and punched...no leaking.