james, most of the shop selling got it from eagle eyes malaysia (distributer/maker). The better ones come from taiwan but they all got a few common problem.
1. There might be water fog inside after rain due to vaporisation of rain-water residual slipping in and
2. the plastic material is not so good of quality hence it will turn yellowish and dull easily if you are running halogen (usually 55W to 110w) and not HID (35w) coz is too hot.
3. The projection from the reflector is not as good as original hence it looks nice but from inside, the view is not evenly spread and far out (inferior compared to original).
I once thought of it but after testing it out a few times, i gave up the idea coz i travel trunk-road quite often in the past at night so i need clear and far vision from my headlamp as much as possible. Of coure, it looks good compared to ori coz is black and 'garang' look ! haha