I ordered 3 with my ToughStack from madvapes. 2 of them fired and really hot. Had a good feeling about them, but they won't produce vapor after a few puffs on a new cart. I'm no expert, but I think the bridge is too low and it doesn't contact the cart batting. I am out of spare Joye LR attys, so dug out a new regular Joye atty and the ToughStack vapes like a charm with it. 21 bucks flushed down the drain. Aaaah, well, I guess learning has a value as well.