They are all the same. Read the terms and conditions on the true manufacturers website. You'll see that they will put whatever badge you like on them. Oberwerk are just another retailer, making their cut on a cheap Chinese product just like our retailers here do.
Even if Oberwerk stipulated more stringent testing, the Chinese would either just tell them they're doing it, or if they do, would apply that testing to all. It's a production line.
http://www.binocularschina.com/binoc...ocuser_45.html
Cheers,
Jason.