Winter came, summer time adjustment done, and it's dark both when I go to work and when I get out. So finally the super duper X-Treme Vision found their way in my headlights. As many said, swapping them was swift and uneventful. I didn't even have to re-aim the lights; maybe I'll have to adjust the lateral aim on the left a bit, though.
Veredict: improvement. How much? I don't know. But as I said before, a 100% increase in output amounts for about 30% more perceived light, and I would concur with that. Oncoming cars haven't flashed me in protest so far, and German drivers are very... how could I say it... demonstrative when they don't like something. However, cars driving in front of me seem to acknowledge my presence more easily.
One thing that surprised me is the softer cut off from the illuminated area to the non illuminated. It's less "offending" or drastic, specially noticeable in the curves, which is welcomed.
A point in which I'd like to improve the style of the thing is the dissimilar color of the main lights compared with the two little, 5W lights in the nose of the bike. The OEM bulbs in the headlights were already whiter than the little lights, but the Philips are much whiter yet, so it looks odd for me and I'd like to improve that. Are there other, whiter 5W bulbs to mount there?