Has anyone used Meguiars Headlight restoration kit? Or are there any that you have used that you would recommend? I have an 04 XC90 with really hazy and yellowing lenses.

 

Yep, 2 cars winter of 2010 but not on a Volvo.
'99 Tahoe, results so-so. Plastic of such poor quality (soft) that it really couldn't get them much past about 60% better, then quickly went bad again.. replaced them.
'98 Infiniti, much better results, I'd say 95%, but also a bit of backsliding in a few months. I'd say they stabilized at about 90% for the past year.

You really need to sand them first and then "powerball" the livin' daylights out of them.

 

Took care of the headlights yesterday. Sanded the bejesus out of them and buffed with the compound and supplied buffing pad. I would say that I am very pleased with the results. 95% original condition. I think if I would have taken more time on the first light that I did, it would have turned out clearer. I tend to get impatient. Great product, would definitely recommend. Pictures were too large to attach to this reply. I will work on that