I'm Just a normal user who would like to stay up-to-date with software updates provided that they will not hinder my device. A true upgrade, not a promised upgrade which has negative consequences.
Every upgrade has its share of potential tradeoffs. If you don't want negative consequences, then not upgrading is the only way you eliminate that risk. If you want to stay up-to-date on features and security, then the only way to do that is to update and assume the risks.
People who lose sleep over every perceived instance of lagging or bugs should just wait for the end-of-life (EOL) version of an OS before they make an upgrade. X.0 versions of any OS will have bugs, while the EOL version will have gone through the performance iterations and bug fixes.
Even the much vaunted OS X Snow Leopard had one of the most serious bugs ever (where logging into a guest account would delete user accounts) with version 10.6.0 and broke more applications than any prior OS X release.
If you're already on iOS 8, IMO the update to 8.2 is a no-brainer.