That is the "sister" bike to my Wicked that I got recently. He has had it on eBay 3 times already, moving the Buy It Now price all over the map. If it is as nice as the bike I bought, and I'd bet it is, the thing is brand new. If I had the cash, I'd have hought that one, too.
He priced it correctly now, with the LX spec and Quadra fork, though at least it is threadless. He had it up there for over $700 recently.
He's a good seller, and hyper-anal about his auctions (scans of shipping receipts and everything), though he will insist on UPS for shipping, which made me a little upset after getting the frame gouged on the way here.
If you can swing it, I'd say go for it. It's about as NOS of a complete Sommerville Fat as you will find, sans granny seat pad and pump bag that pinches the shifter cables.