I had a very good experience with Korth's handling of a Leupold warranty issue.
I received a new-to-me (aka used) Leupold scope that was missing the gas plug. I contacted Korth to see if a replacement plug was available and they suggested I send the scope back for inspection and to make sure it was still properly gas purged. Since shipping is not cheap, I asked if I could send in a few other older Leupolds for a general inspection. "Sure, please just indicate what you need looked at in your letter.", was their reply.
I ended up sending in 4 scopes that were received by Korth mid-January, and yesterday I received them back with full inspection reports. My wait was under two months, which was a pleasant surprise as I was expecting them to be quite busy these days and was prepared to wait longer.
Korth re-gassed all the scopes, replaced a couple of minor parts and seals, cleaned the lens inside-and-out, and inspected/confirmed calibration and tracking. I received all the scopes back in their original boxes, exactly as I'd sent them with a detailed explanation of what was done.
My only "disappointment" was that the oldest scope I sent, a Leupold M8-3x, was confirmed by Korth to not be tracking and because parts are no longer available, I received back a NIB FX-3 6x42 replacement. The disappointment was that the M8-3x is a unique scope that has a bit of a cult following, so not being able to get it repaired was disappointing, but understandable. I would have also appreciated a call/email from Korth to tell me about the replacement of the M8-3x with the 6x42 --- had I had the option, I might have asked about the availability of a lower-powered replacement (2.5 or 4x as a better equivalent to the 3x). That being said, I can't fault Korth or Leupold for their excellent "no hassle" warranty service and their prompt communications when I was initially inquiry about the missing gas plug.
I was satisfied with the result and it reaffirmed my confidence in purchasing Leupold products here in Canada.