KEH are very generous in their policies for returning products and for paying the costs of shipping.
I have only used them a couple of times but the last one was not too satisfactory.
I needed a lens in a hurry because I had promised to take a lens of mine to Africa for someone else to use and when I received my lens back from the last person who had borrowed it, the focussing was jamming.
With just three days to go before departure, I called KEH who sent me a "Ex+" quality replacement over-night. Unfortunately, it was definitely not an Ex+: there was a looseness in the expansion joint.
I let KEH know immediately but there was no way for them to send a replacement before I left.
Sure enough the internal screws loosened during the trip and, by the last two days, it was no longer focusing properly.
KEH accepted the lens back for a full refund (and they paid for the return shipping) but this shouldn't have happened and their staff need to take a lot more time and care when rating equipment.