It may or may not be counterfeit. I have seen that complaint often even with Digital Rev which is a big company that ships from Hong Kong as well. However, I just paid $180 for my 7D grip, so its not so insane of a good deal that it seems fishy. However, it also states that you are responsible for import duties and taxes. Customs doesn't check EVERYTHING, but if they do happen to check your shipment, you may owe money upon delivery of the item.
I won the bid but I ain't paying lol I don't care my eBay I'D is so well and I have all good reviews. I outta 500 won't hurt I'm retting on the grip and may spent the money toward a 2nd speedlite instead