When something is sold as factory
refurbished that unit was physically inspected and tested and passed so it should not be an issue, in fact if you look at it this way that unit was checked and passed, units coming off an assembly line are not checked a unit is randomly pulled and inspected to make sure specs are meeting requirements.
Something labeled refurbished does not mean it was bad either it may have been returned for any reason, but it does have to be checked once returned and if it passes it gets the label refurbished.
They all carry the same factory warranty so save some $ 