with ebay its always a risk, but thats the cost of getting it cheaper.. You need to consider the add and its content, check out the seller, etc.
The item is listed as located in Aus, Often the cheap dodgy stuff comes from china and other random countries (though good stuff can also come from china, etc). He has a reasonable amount of feedback (5k) with over 99% positive which is good.
I would never buy a tv or computer or something like that from ebay, but stuff like this is not so bad (no moving parts or major mechanical risk (not gunna blow up your car if its crap)).
If you really are worried about getting the best quality, go and buy from a reputable store and pay top dollar, you get what you pay for =)