You'd be a brave man to bid on those... The description has them listed at a tenner cheaper than the "buy it now" price, the sellet's pushing for a quick sale, and the items are from hong-kong, meaning that the seller is far away and if something were wrong, it would be much more difficult to sort out.
PLUS, the company claims to be all about promoting chinese hi-fi... and I would recon that Mr. Grado is more of an American, where he lives and works etc...
PLUS, you are only offered a 1 year "LOCAL" chinese warranty.
Ebay terror abounds.