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To the original question - I would expect used high quaity gear to work exceptionally well and be pretty bullet proof. I would expect a seller to state in advance if there are real problems with the gear being sold. I expect any high end mount has a non trivial learning curve to reach peak performance - not to do routine actions.
Grinding noises on first use sound like a major whoopsie that the seller and buyer should both know about before making the purchase decision. If the seller is unaware of these - or states they never happened for him - that's one thing. If they knew but didn't disclose that is another.
These mounts have a killer reputation at the price point, especially for robustness. If it's more than normal wear and tear I would ask what has this thing carried to be making the noises you have observed?
Hopefully the buyer and seller can come together on this and reach a great final result.
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