Also remember what a disaster alot of us-systems were that went untested by real battlefield situations for decades. https://www.vice.com/en/article/8xkgw4/patriot-missile-saudi...

Its clearly a mostly unuseable trade chip of buying projected security for buying weapon exports. Which is okay, but for actual protection, look towards countries who actually use the equipment they have regularly in a warzone against a opponent similar to the expected opponent. Israel, turkey, other middle eastern countries, lots of african and some south american countries come to mind.

Everything else is.. a mixed bag