My ipv3 li has been basically thrown from across the room. Loads of nicks and scratches and it still performs the same as when I purchased it. This piece of Chinese machinery is very strong and it feels very strong also. istick 100 watt was a great performer but when putting on my Legion rda the 510 connection got stuck inside, caused all sorts of shorts and errors. Ipv4s on the other hand, it took a couple drops and the inside battery sled cracked making the batteries very loose and sometimes will turn off randomly. From my experience, a 50 dollar mechanical mod will last you twice as long as a 100 dollar regulated device. Im using a Phantom copper mod and it hits greats. No hot button issues even on a load of .18