Something to consider - there are warranties and there are guarantees. Leupold offers a lifetime guarantee on all of their scopes (whether you are the first or fifth owner). Should your scope fail, you send it to us for repair. Once completed, you will receive your scope back. Other brands (not limited to only one) simply throw a lot of the defective scopes away, as they are unable to be repaired. This is due to two reasons: their scopes are so inexpensive to produce, there is no financial sense to spend the time to repair; and the heavy use of glue in the production process will not allow the scopes to disassemble without damaging the scope.
One poster made an excellent point about the source country. There are a handful of manufacturers in China and the Philippines that produce optics for several brands. Some of which are built in the same factory, with the same quality controls and technology. The only difference is the marketing to the buyer.
The sport optics industry has no standardization, which allow for any claim to be made by a brand, and no way to ensure what they say is accurate.
This post is intended to be informational, and not at all to be taken in a negative or accusational way. We are open to share what we can on the realities of the optics industry.
KGL