Hi Roswell,
I have Philips Vision Plus in my Cinquecento (put in over 3-years ago) and they are fine.
But they were already considerably better than the headlights in my 156!
The 156 got HIDs 2-months later because the very good Cinq headlights made the appalling 156 headlights seam even worse!!
i've got them Cinq but not used it at night yet - from waht I can see they look nice and crisp white, and the blueish sidelight looks pretty fking cool
As for the power I don't know...anything to get brigher is worth the extra 7-8£