I have mixed feelings about Chinese products. I've never used their e-liquids, so I will refrain any comment on those.
I use Chinese made cartomizers and clearomizers. When clearomizers made by name brand companies such as Kanger, Innokin, and Vision are used, I've had relatively good success with them. Off brand or generics are hit or miss...mostly miss. Anything made by Smoktech or Boge has been very hit or miss from my personal experience. Ikenvape cartomizers are made in China, but are manufactured to higher standards due to the specifications agreed upon between the owner of Ikenvape and the un-named manufacterer, so I have found them to be a superior cartomizer compared to the others. China CAN make quality products, but many seem to not put a priority on this.
There is no question in my mind, that the manufacturing mindset of Chinese mod makers is, "We make cheap, you buy cheap, it break you buy another." China has yet to make a mod comparable to the quality of a Provari, and will never offer the company support after warranty that Provape does. This is a fact, and whether customers decide to spend less for lesser quality and very limited support, or spend more for higher quality and lifetime support, is up to the customers.