FWIW, I replaced the Sylvania halogens (that were installed in June of '06) in my '99 XJ with XV SilverStars around Halloween '06 after one of the halogens burned out. Be sure and read the part where I replaced almost-new Sylvania halogen bulbs with Sylvania SilverStars. I bought them instead of buying regular halogens because they were a cheap (on sale) upgrade that I figured I would try. The pictures at rockcrawler.com are pretty accurate. The light looks not much different shone on a garage door or down your street, but driving on a dirt road in the dead of night, you notice the difference. I've had them on a few vehicles over the years and for a handful of dollars I would do it every time. I do a fair amount of driving in the mountains, but most of my night driving is through this "city", so I cover a lot of different night driving conditions. Do they emit less lumens or CP than a normal aftermarket halogen? I couldn't tell you. They are rated at the same wattage and a lot of people will tell you they light up your surroundings better. Different temperatures of light take less power to illuminate things than others. So even if they do emit less CP, they may very well do a more efficient job of lighting. Example:I use a much lower wattage air conditioner to cool my house now than I did 10 years ago; does that mean it's any less cool in my home now? Things get more efficient with time. Perhaps (just perhaps), the SilverStars are such animals. And as far as my actual driving experiences with the SilverStars? I do wear glasses and am not particularly light-sensitive. I don't notice any increased glare or any of the conditions that others have mentioned here. Do they piss people off in front of me? Well, I often follow my girlfriend home at night and I would hope that she would speak up if they did, and she drives a little Kia. Basically, go buy them and check it out for yourself. Everyone has different results with EVERYTHING, especially in a forum like this with 50 million different users, each with their own tastes, preconceptions and biases. If you don' like them, someone will buy them from you without a doubt. Hell, I'd buy them from you to have some spares. You wanted some opinions? You got 'em!
YMMV....Rich.