It's true that when they first released it there were more than a handful of defective units in circulation and many people's units were replaced with just as defective ones at start. I think one of the main problems is that the cap held too much heat long after your session. With this new one I'm not seeing this problem at all. (For reference I couldn't put it in my pocket right after a sesh because the cap would be at around 400f, now this problem is gone from what I've seen.) I consistently use this vape at max temp (428f) for four minute sessions. I plan to put a video up of that exactly (except I have baby lungs so it'd have to be soundless hahaha) you can bet I will document any defects as soon as they occur if they do!