I got my Sapphire 9800Pro "Ultimate" as a refurb off of Newegg. Works great. I added the Zalman add-on fan, and it OCs up past 9800XT speeds on the core.
Obviously, they're hit or miss (like any refurb product), but just from anecdotal evidence here on AT, I'd estimate that at least 80% of them work just fine. If it arrives DOA, or flakes out quickly (I'd strongly suggest doing some thorough testing once it arrives), you can send it back (you have either 1 or 2 weeks to return a refurb product for a full refund).