Yes, people have commented on Optima batteries being built by a USA company in a Mexican (?) factory. I have a USA 6v Optima from USA factory and two 6v Optimas from non-USA factories.
It seems that people who have Optima batteries swear by them; and, people who sell non-Optima batteries swear at them?
Also, if an Optima battery is drained down, a special charging technique is supposedly required. We had to use a professional charger in non-automatic-charge-mode to charge a 6v Optima that had been drained to "nothing".
