I've bought several balls from them thru Ebay. I specify my desired specs upon payment. Of the 7 or 8 (or more ?) balls I have bought from them, only 1 was not EXACTLY what I requested. They insist that they cannot guarrantee the request. At Ebay type prices, such a record is laudable.
I'd suggest making sure that the ball you bid on is one in decent supply; that means they'll have a decent selection of good balls. I think that's all you can do. For an Ebay seller, they have a very good record, for me, at this time. Please note the emphasis.
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Just like hand grenades and horse shoes, in bowling you only have to get close ...