I had an art vapbong that broke and was repaired by Collyland. I was happy with my experience, this is what happened:
The vapbong stopped heating up at all. I had been using it every day for about two or three months from memory.
They would reply to my emails within a day or two. Firstly they sent out a new power supply to me in London, which arrived within a couple days. When that didn't work, they emailed me a courier slip and I sent the unit to them at their expense. Once they had it, it took them a week to repair the unit before they sent it back out to me. It arrived safely and working. Because of the timing, my courier got caught up in Brexit post issues so the overall timing ended up being a little over a month from memory. It would have been much quicker without Brexit coming into effect that week. This all went down near the beginning of this year.
My takeaways from this experience is that their customer service is really good, and that maybe it's not a good idea to use these delicate and beautiful items every day for months at a time? But perhaps I was just unlucky. My unit is a slightly unusual art vapbong, I'm not sure how much that played a part in this. This vapbong is still my favourite vaporizer by a long way, and I'm so glad it's back and working great.