@Berri it's pretty cool, especially when you have metallic subjects, like cars or skyscrapers. I tried it on portraits, too, and it has those awesome Endura colors, but doesn't fit my cultural expectation of a portrait.
I bought a 288' roll of 8" metallic (EDIT: expired 6/2012), I cut up maybe 30 sheets of 8x10, and only used a handful. I'd be happy to mail you a sample if you're curious. PM me your address and I'll figure shipping cost. Unlike the roll, I haven't stored it in the refrigerator, but it seems to be pretty resilient. YMMV.