Bugs:
*Safari in this build, still sucks. I frequently get dead tabs in which pages appear to be loading (progress bar), but then never actually load until I crash safari, kill it in the multitasking tray and try again. (I have this issue on the iPhone 4S and the third generation iPad)
*The music app has this persisting problem where it won't have album artwork when using iTunes Match. All of the Albums in my iTunes have album artwork, but some are missing when using an iOS device. (I have this issue on the iPhone 4S and the third generation iPad)
In addition, the Music app has lost the ability to count when using iTunes Match. In artist view the app will say I have (insert random number of albums here) when in actuality, I only have one. (I have this issue on the iPhone 4S and the third generation iPad)
*Finally on the iPhone I still have the ambient light sensor bug that makes the screen unusually bright, even though the light in the room hasn't changed.
Overall, I would say that his has been the most stable and least buggy update but there is still work to be done.