This is getting absurd...
Just look down the forum
Less then ten below-debate about refurb
on the top page of this section-iMac refurb
still, on page one-debate about refurb Macbook
still on page one-someone who doesn't like their refurb
In my opinion they are safe, buy Apple Care and you should be fine.
By the way, there is different opinions about the refurb Macbook (and Macbook Pro) compared to the desktops, since the notebooks obviously takes some abuse