Best answer to your question is to tell you to ring the strings for each upgrade (sticky at top of forum) and see what the users are reporting as they upgrade.
Some people advise that if you are having no problems, especially if you are in any way uncomforatable or unsure about the upgrade, to leave it alone.
(Others of us upgrade as soon as a new OS is posted.)
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Personal: iPhone on AT&T
Work: BB 9650 on Sprint
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