I think I've bought six staves (3 osage, 2 hickory, 1 elm) there and I haven't had a bad experience. Really study the pictures and descriptions. I've seen staves that the seller has described as having no knots or just a couple of pins and the pics clearly show decent sized knots. Some sellers exaggerate the thickness of the rings, too. Medium rings turn out to be pretty thin.
All in all, I've been satisfied with the staves I won, though. One of the osage and both hickory staves were actually nicer than I expected. The other two osage staves were split narrower along the belly than I'd expected, but they still made nice bows.