Someone had to start the HID saga again. Well done. We had forgot about it.
Have not install them but from memory many have and are happy with the mode. There was a big discussion on old forum about kelvin (6000,7000,8000), and installation procedures like putting the ballasts outside and securing them with silicon when others put them inside the headlamp behind the reflectors, others talked about how to drill the holes in the plastic caps, and some were asking if they are canbus compatible, they are.
Avoid installing in the high beam cause the delay from the ballast will effect it.
As long as they pass MOT and the installation is done by a skilled electrician no issues are expected.
We had found in that passed discussion that all were made in China and the difference was the retail price depending on who sells them.