The chip isn't very good, specifically the battery management. Find power drops when the battery still has like 3.9v in it, not great for anything over 60 watts unless you don't mind changing batteries every 100 puffs (stupid for a single 21700). Fill port is annoying. Nice feeling device, well made, but not worth the retail price. I wouldn't buy another.
*Theres quite a few people that have had various issues with the chip aside from the power management, Vaperz Cloud seem to have been very good at quickly helping people out which is a plus.