I got a couple of these, managed to break the ceramic cups in both of them and I'm not the kind of person that's in the habit of breaking stuff. Just wiggling a screwdriver, trying to position the coils and happened to catch those little teeth that protrude up, they snap and take a big wedge of the deck with them. Not even sure what purpose those teeth serve other than to obstruct access to the deck.
You can't change the drip tip either and the whole thing inevitably gets hot as fuck, whatever wattage you run it at and takes an age to cool down because the glass transfers heat to the metal driptip.
So yeh, I'm not a fan.