2012 SRAM Red XG 1090 'Powerdome X' Road Bike Cassette
Only 30 or so of the XG 1090 cassettes are in the USA as I write this. I bought one of the first units from Palo Alto Bicycles (the only one).
Just posted is my review of the new SRAM Red XG 1090 'Powerdome X' 11-28 road bike cassette. Great product, and well worth considering over Shimano DuraAce.