I have a boatload of leupolds going back as far as the 60's, a couple have been in the shop for free reapirs in all that time. I had one Nikon and it was in for fogging twice . they did fix it free as well but not near as fast as Leupold.
Even if I thought Nikon was as good I'd rather give my money to an american worker anyway.
Stay thirsty my friends