Yeah, but it's probably their suppliers. let's face it, at the prices they charge, you're not buying a product lovingly assembled and subjected to 3 QC checks before release.
I once got a KF3 mini from them, and it kept leaking no matter what. Took a good look at all the o rings, the threads, it all looked good. Finally looked at the glass and discovered one end was cut on a bias which made getting a seal impossible to accomplish. Someone released that from a factory somewhere like that. That was my second and last try at FT clones (had a problem on another KF5 right before). I love them for all the little odds and ends you struggle to find, but I decided stuff like that wasn't going to work for me. Works for lots of other folks around here, but the vape fairy refused to enchant my clone orders from there.
OTOH, I have 2 Merlins that must have been dusted with vape fairy stuff as neither of them have ever leaked on me. Win some, lose some.