I passed on one last summer (ding in the frame) but it was a nice riding and pretty darn light. It had a 531 frame and seemed to be pretty good quality.
edit: I can't find the info that I had, that I thought stated 531 tubing. Might have just been double butted chromoly of some other breed. I hate it when I remember things wrong, or can't find the data to confirm I am right.