My $50 refurb Pearl from ATT has been just peachy. Usually the carrier's refurbs come from people who return in the first 30 days for whatever reason. Any devices with real problems are usually weeded out.
Now, if you're buying from a random 3rd party, that's another story.
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8300 Curve: viigo, gmail, google maps, way too many emails/day
My employer has purchased maybe fifteen 8310's over the last few months. They should now be free. Our most recent order was. All of Them are visually flawless. Even with the plastic strips covering the device front to back. Come loaded the 4.2.2.170 firmware.
However, some users have reported an inability to use Bluetooth. I have NOT verified this!