so why spend on over priced joytech .??
Better build quality compared to knock-offs. Not all, but most "fakes" use cheaper components, including batteries, and internal electronics. The general reason why this stuff is cheaper. They tend to cut corners without knowing what effect it may have. Sure, Joytech may have a slight premium to their pricing or margin structure, but they stand behind their products. Knock-offs do not.
I work in the electronics industry and have seen first hand what counterfeit product looks like and the quality it's built with. This stuff is junk that would never have passed the testing the fake "CE Mark" (or other safety certification) it's stamped with indicates.
Sure, sometimes the product works, but they have a much higher chance of failure than genuine product. When talking about higher tech batteries, or controlled circuitry I'll trust my money with the originals.
I know you use a mech. would you even consider putting a "no-name" battery in that device you spent a fairly substantial sum of money for knowing the inherent dangers of battery venting and explosion if that battery were to fail due to bad build quality?
Anyhow.. now I'm just rambling. Long story short, I never recommend knock-off product to people. You're ALWAYS better off buying original hardware if for nothing more than if something DOES go wrong, you have some recourse with the manufacturer.