I bought a Juul a while ago and had no problems with it. About 6 months down the road the internals started sliding out of the aluminum housing and I emailed their support team. I told them my issue and that the juul still worked but they should try and fix this issue for newer Juuls. I got a response in 12 minutes. It said that a new Juul was on the way, and in less than 48 hours it arrived. That Juul was the new version (with the bigger charging ports) and it has lasted me to this day and counting. Recently (3 days ago) I had an issue with pods leaking. Not through the mouthpiece, but through the bottom of the pod. I told them that I would hardly use a pod and it would be empty. They emailed me back promptly and sent me a some free pods without hesitation. 10/10 customer service.
The reason I gave it 4 stars is due to the price of pods. $17 is a little high considering how little juice you get in 4 pods.