if I'm running 5.0.1659.36, should I upgrade to 5.1?

I've noticed some other posts include people running 5.1 instead of 5.0, but my ReSharper -> Options -> Environment -> Updates says "There are no updates available." (the checkbox for 'Download the list of available updates from the Web' is on)

1) if 5.1 is 'release' (the resharper download area is on 5.1), why does it says 'no updates available' when I'm still running 5.0?
2) is there an available list of changes/fixes in 5.1?
3) should I upgrade to 5.1?  Any reason not to?

Thanks!

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