I don't know who manufacturers their products. It might be themselves or some other company under contract. However, they are more than a marketing company (and yes, I know what their name stands for). At very least their products are engineered by, and possibly for, them and are unique to the company. They even hold patents. They are not simply rebranded like a lot of companies do with Troy sights, as an example.
Don't take the above to mean that I think their products are good or that I would buy them.
YHM QDS. It's a backup sight, and you're probably never going to go into protracted combat. And even if you do, the sight will still probably stand up to just about anything the Troy will.