For me it would depend on the knowledge of the person selling it. I have a Rev I that has been pretty good. I did send it back once, but the cause for that was operator error. The person I bought from was known to me, an electronics guru, and was switching to legacy. I knew if he said it was working I could believe him. I would not pay for one on ebay or another auction site, but that's just me. If a reputable hobby shop is selling it a reasonable price and telling you it works it should be okay. If it is working properly it can be upgraded to the latest software.
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