Upgraded today from 266 to 282, without reinstalling apps and restoring settings.
Manually re-downloaded all my apps.
Reconfigured my BlackBerry.

Found out that :
-reboot is faster
-3G comparable to 266
-picture thumbnails display way slower
-WiFi fast (like 266)
-browser speed like 266 (good)

Not tested :
-calls (failed calls, network path not find etc ...)
-battery life under 3G