Interestingly, I swapped out the OE Philips Long-Life H7 bulbs in my GTI for a set of the Xtreme Power bulbs, and found no difference. Zero, zilch, zip...
I changed them one at a time, just so I could compare them side-by-side. From all perspectives, there were no perceived differences. It might be cheaper to just buy a set of Long-Life bulbs.