I got my 70-200 f2/8 IS II from canon as a refurb. Saved a ton (was a 'refurb inventory sale' at the time too) ended up paying under $1800 for this lens... At the time it was only a 60 day warranty, however since this time Canon now has a full 1 year warranty on refurbished items.
As for the quality? Well, I didn't get a box... but that's okay because I _throw the boxes away_ don't have room to store empty boxes... sorry collectors. And uhm... oh, there's a very small amount of play between lens and body, like, a miniscule amount, but it makes no difference. I tried to make it make a difference, tried to make the play make a difference in photos (locked the lens down to tripod / jiggled camera, etc...) but it doesn't. The tiny amount of play is widely reported on several lenses, so I feel nothing at all is wrong with my purchase but I suspect someone got this tiny bit of play and just couldn't stand it. I'm pretty anal about how stuff is since this gear is a very big expense for me, however, even if this lens was purchased new the play which is hardly noticible wouldn't be enough to make me exchange/return. Sorry rambling now because I just love this lens so much.