I usually upgrade as soon as it's stable. There has never been a downside as far as I can remember, because the old stuff usually just keeps on working. Whether

I usually upgrade as soon as it's stable. There has never been a downside as far as I can remember, because the old stuff usually just keeps on working. Whether that's been good for the language itself is debatable, but I imagine it sure helped adoption since they almost never break anything when they push out a new version.