Simply put, it does what's it's supposed to. This bad boy turned my almost beyond redemption - yellow crust covered headlights into working headlights again. It didn't turned them into 100% "like new" headlights but it did restore about 90% of their long gone "Like new" look. Which was more than enough to pass with flying colors the rigorous Maryland State inspection, which was basically the reason I purchased this thing in the first place.
Just a word of warning: Grab yourself a low stool or chair to sit down in front of your headlights at a comfortable level and 2 or 3 servings of the cold drink of your choice and Be prepared to spend the most boring hour of your life rubbing this thing until your forearms go numb. Yes, this thing works but it's 50% elbow grease powered. But for 10 bucks and with the included pads, you can't go wrong. Oh, and you'll only spend about 1/4 of the contents on the job (2 headlights). So I'd say this kit lasts enough to restore the headlights in 4 vehicles. 1 more thing: Make sure to have a little bit of car wax at hand before starting the job. You'll need it at the end to seal the finish and it's not included in the kit. (I noticed this just when I was ready to begin and I had to drop everything and make a run to store for some wax) All in all, just for the bang for your buck and the effectiveness of the product, 5 stars.