archival cd-r - really true?

I hate to revive this, but I've never seen this info posted before. Can anyone who really knows (i.e. data, not opinion) comment on the quotes below? These are from a (more or less) private email list. "The best technology was developed by Mitsui and is now manufactured by MAM-A, referred to as "Archival Gold". It uses a gold / gold phthalocyanine process which does not oxidize and is more resistant to the plastic failure. They have done accelerated testing and advertise the product as being good for 300 years. NIST and some university labs have been doing comparative testing and there is some belief that the life will be well beyond that. You can get a spindle of 50 for about $100. A step down from this, Taiyo Yuden makes their "silver" quality. Taiyo Yuden developed the original recordable CD/DVD technology and has remained an industry leader. Their product is advertised as 100-year. Taiyo Yuden disks can be had for under 50 cents a disk, getting to be more like 35 cents. There's really no reason to buy the cheapie stuff any more." Clearly if this is true I'm switching to the silver ones and buying some gold ones too. But I am skeptical... (300 years does meet/exceed my archival goals :-) -brad