Holosun models are made in China, and it's suspected the new SIG models are, too. When you note the same controls in largely the same place, same configuration, same finish, and the same pricing - then what is there to question?
There is a big internet full of forums and websites that discuss things in detail. I googled this up:
http://www.holosun.ca/index.php/about-us
In the article it referenced a VP of Holosun stating their products are made in China In fact, they were making the optics for others and decided to put out their own line. I can also reference a statement from the owner of Lucid that his scopes are made in China - in the same plant Aimpoint, Eotechs, and other brands are made.
China making Aimpoints? Sure - only the .Gov contract optics are required to be made in the USA per the Berry compliance regulations. For that matter, the Army can't even get US made running shoes and has been jumping thru hoops to create a vendor to supply them. So far IIRC we are handing out Korean running shoes. The first shipments of black berets were even Chinese.
Is the Holosun equal to Aimpoint for durability? Consider that the Aimpoint doesn't have break proof lenses or is bullet resistant. You beat on it and you can break it. There are red dots which were specifically made to compete for the red dot contract on the market, my suggestion would be to find out if Holosun submitted theirs.
I don't think so.
Their slogan is just marketing hype, take it with a grain a salt. Look at owner's recommendations and how they have held up. Short of buying 30 of them and having an Infantry platoon deploy with them we won't ever be really sure.