There are some items on sale on EBay (and perhaps other places as well) which are NOT what they purport to be. See
Pro/Forums for specifics.
Basically, buyer beware!
It may look very similar, but channel size, baseplate thickness, and other dimensions make a difference in performance. You won't necessarily be getting what you thought....
Plus, the dude implies that his block is the WhiteWater block. False advertising!