Anyone here upgraded their headlights?

Brighter bulbs (like the Silverstar Ultra) are indeed brighter than standard bulbs, but that comes at the expense of very significantly reduced bulb life (which is usually listed in the small print on the back of the package, though I'm not sure if there is any standard across manufacturers for the tests). Particularly if you do a fair bit of night driving, that may be a worthwhile consideration.

The reason for the reduced bulb life is pretty straightforward: they burn hotter, in order to be brighter, and so burn out more quickly. As the saying goes, there ain't no such thing as a free lunch.