I've used it - it's the real deal.
However, I now use Alpha Male, which is a combo of TRIBEX, RED KAT, and M.
Biotest prides themselves on the quality of their extracts, so I don't think you have to worry about what the other sites said about U.S. products.
I'm sure the search function will help out with more reviews.
Also, it's only 20 bucks with a money-back guarantee. Why not give it a shot?