I haven't had one die yet so I don't know. I can't imagine them being much if any different than any other type of atty out there to be honest. They are built really solid, good ingenuity on the design, and I have so far refilled this one I am trying to stress test 18 times between my wife and I both using it as much as possible. I also have one I am using for only dripping when I get the chance and it is still doing fine also.
So I got a 10 pack, I've used 4, I have 2 refilled and ready to go for work tomorrow and will refill this same one again before I leave for the wife. That will leave my wife with this same 1 refilled and the dripper while I'm gone.
I'm truly impressed with them so far. I am looking forward to seeing justh ow long they will last
Take care,
- Hap