I haven't bought anything Teng Tools for a decade. Do they still do the no quibble type lifetime warranty? I remember my local dealer used to replace anything Teng, even if a ratchet had been broken from mis-use.
Not sure about mis-use but the biggest issue these days is so few places actually stock it. I've got a couple of bits I need to get replaced and I emailed Teng and they said just go to a local dealer and they will replace them. The reality is they will probably be sending them back for replacement.
I like their kit, I like the fact that the spanners are not chrome/shiny.