If the truth of the matter is correct that it is repaired, it is probably in better shape than the new ones....
I returned one once, received a rebuilt one and it still works, this was like 6 or 7 years ago.... Buddy of mine bought a new one about the time I sent mine in and he has had 2 replacements also, new ones, and the last one is getting ready to take a dump....
When you think of used, instead of rebuilt, you are in a different ball game..
Just like a used vs rebuilt engine..... Used, cheap, or rebuilt expensive, just as good as new or even better in some cases. Rebuild is all by hand, not robots....
RJ is dead on. I know a guy that worked for IBM for 30 years. He claimed that you can't go wrong with something that has been refurbished. The item has been thoroughly checked out, where a new item isn't.
So, I would bet the next one you get will work for a long time.