....or are they either a waste of time and money or at the best jst temporary ?
If you can buy an inexpensive reproduction new, that is the route to go. For my wife's 300M, the OE headlights were getting hazy & never illuminated the road in front of you at night very well. I bought a pair of aftermarket ones from the internet ("Eagle Eyes" brand) & they were perfect fit, & functioned MUCH better than the OE ones. They have been on the car for 2 years now & still look perfect.
