It works well but you have to wet sand the clear off the lights some times there is cracks in the glass but you can only see the cracks and specks with the lights on so it that bothers you you should not wast your time and just get new ones that's what I'm doing lol I used the kit and my lights look new but there is specks I think due to the heat of the bulbs
I wet sanded using the 3M kit using 500 grit 800 1000 and 3000. Next I used the compound that came with it and finished it with Meguires pastic scratch remover. The tiny cracks you are refering is in the top surface layer and I was able to remove them without any issues. They make a version of the kit with a drill attachment which make the job go faster. The are a lot of after market headlight assemblies out there that seem to fade quickly within two years so its not worth the $100 or $200 to get them. A little elbow grease goes a long way.
If you're not fixing it, you're not driving a Jeep.