It works pretty well for me and is easy to use.  It does need to be applied and then buffed off properly.  It is not expensive, so it is worth trying.  From what I have heard, headlights can also be fogged on the inside, and of course it would not help for that.  Consumer Reports says that the Sylvania and 3M restoration kits are the best, so I may try one of those.  The Meguiar's is cheaper, easy to use and definitely worth a try.  I use one lint-free cloth to apply it and a clean one to buff it.