Good on you for doing the research, the Knox is certified to the highest standard possible i.e EN1621-2 at this level it is as far as CE goes as good as any other, CE is NOT be all and end all, it just says it meets a standard.
Other factors come into it, I suggest you look at this video and make your own call, in my opinion the KNOX Aegis is the best on the market, it meets all standards as well as dominates all other brands on features and comfort.
check this out dude
http://www.youtube.com/watch?v=QC-INgZC8j8
you can get them on our site and I suggest the 8 Plate race, as it has better coccyx protection which many lack
cheers
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