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This review is from: Philips X-treme Vision H4 Headlight Bulbs (Twin Pack) (Automotive)
There is some debate online whether these bulbs improve the vision at night or not. I side with the improved camp. The signs I approach seem brighter, the shadows less dark, and I think the range of the lights on full beam is improved. I drive an older model car in largely rural Scotland, so we have wet, dark days and nights in winter. I have been sufficiently impressed by these that I've replaced all our vehicles bulbs with them. I'm not sure I would pay full price, I would wait for an offer. However a worthwhile investment.
Don't expect massive improvement on dipped lights though, they are brighter. However the design of the dip mechanism points the lights down when dipped at a specified angle for a stipulated legal range. so you aren't going to see any further on dipped lights. It's on full beam you'll see a difference, and in foul weather.