Refurbished devices are supposedly as good or better than new because they have to go through an inspection checklist before going out again. I believe you have a 90 day warranty on the device as well.
My latest replacement is great. Had to go through two others before the proximity senor issues were taken of. But now I'm pleased. I've found that reloading your apps. over a couple of days works best. That way you can see if any of your apps. are causing any issues. Good luck.
My original Droid's mic died, so I couldn't hear anyone. Received a warranty-replacement refurb Droid. It looked identical to my original one when it first came out of the box. No issues here with the refurb.