Depends on the manufacturer. All refurbs are not created equal. Many places will use different/substandard/used parts when they fix the units for refurb sale. It's always a bit of a gamble.
Apple refurbs are a very good deal. I know for a fact their refurb units use the exact same new parts that go into their new models. And you can still get warranty coverage on a refurb unit just like a new model.
I've ordered a few Lenovo refurbs too, and those have all been solid.
I've heard decent things about Dell Outlet. But I've never dealt with one. I think they will let you get warranty coverage on a refurb too.
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