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Any refurb computer was once owned by someone. They had a severe
problem and Apple replaced it with another new computer. They took
it back and worked on it for an unknown time. You don't know if the
problem was discovered and if it was fixed...but you will after you
set it up. If its bad, they will repair it but NOT replace it.
Don't cheap out...buy a new one.
What a load of fertilizer. Yes the system may have had an issue, but Apple has definitely fixed it before they put it up for sale as refurbished.
And you ignore the fact that refurbished machines can be systems that people bought and returned for one reason or another. In some cases they decided on a different system. Got buyers remorse and just returned it.
And while you can get a refurbished system that has an issue or develops an issue soon after you get it, the same can be true about buying a system new.
What makes buying Apple refurbished worthwhile is that you get a full warranty and can add AppleCare to it. And also with the price discount you can either save money or buy a better system than you could afford to get new.