If you have a high handicap and want a minor upgrade to your short game (i.e., better greenside control), these will do fine. At $17.99 after shipping, you get a dozen balls at the same price as a low/mid quality dozen but far better quality. These "cleaned" balls are better than refurbished/refinished balls because those balls often have an extremely low grade paint covering that drastically changes the performance of the ball.
If you have a low handicap, you will be sorely disappointed by the quality of these balls. Mid-grade means they allow scuffing (i.e., cart path damage) and other blemishes. While they claim that the performance of the ball is unaffected, this is simply untrue. The biggest problem is that they do not verify the compression of the ball is intact and there is a high probability that some of them will be "dead" balls.
TLDR; If you shoot below 80, skip this Woot. If you shoot between 81-110, grab three. If you shoot over 110, sell your clubs and buy an Xbox Kinect and Tiger Woods PGA 2013.