I can't remember if the Prestige has CE mark approval (Europe's equivalent to USA FDA's blessing) but if it has you should be able to dig out the report they submitted for their approval to show that the disk does work.
The answer to your second question is that there isn't a disk that has been proven to be substantially better than the others in a clinical trial or through an extensive use history. All we have is speculation, analysis based on speculation, and lots of marketing.
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Laura - L5S1 Charitee
C5/6 and 6/7 Prodisc C
Facet problems L4-S1
General joint hypermobility
Jim - C4/5, C5/6, L4/5 disk bulges and facet damage, L4/5 disk tears, currently using regenerative medicine to address
"There are many Annapurnas in the lives of men" Maurice Herzog
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