Badly made & no customer service.
I bought a Troll X RTA. The first time I filled it with liquid it leaked the whole contents. I had to use the PTFE tape trick which helps but by the end of the day my mod is still swimming in liquid in the 510 screw connection. No matter what I do it still leaks. Also the rubber gasket around the fill hole ripped within a week. I contacted Wotofo 3 times to ask where I could get another gasket from. All 3 messages were ignored with no reply. As their products are badly machined so they leak and absolutely no customer service to my 3 requests for assistance I can't give them more 1 star.