Earlier this year, I tried to purchase a refurb 360 from the Geeks. First one RRoD'ed within 10 minutes. No problem with the Geeks, they sent another with prepaid return shipping for the first. Second one RRoD'ed within a day. Returned to the Geeks and got a full refund. (Also, MS was willing to support the refurb unit for the RRoD warranty.)
The moral of the story is that you may have good or bad luck with refurbed 360s, but if you buy one from Computer Geeks, based on my experience, you can rely on excellent customer service.