Hello Folks,
Do any of you know whether the aftermarket xenon upgrades are good or not?
If so, which?

I have been looking for an OEM upgrade for my W140's to no avail.

eBay, and other venues, are full of aftermarket products which are Chinese if I am not mistaken.
Most Chinese products seem to be built cheaply thus I do not want to experiment to find out which is built well enough.

Thank you.