Phone seems to run alot better since going to jelly bean but I have had some minor issues. Couple of apps said that they are not install so I had to reinstall 1 of them, words with friends, but even after reinstalling notifications don't come through, no big deal. The other one is the gallery app that comes stock with the OS, not sure why it's saying it's not install but I can't reinstall it as it's a default app to the OS. No big deal as I can go use other progams to look/watch photos and videos. Other then those 2 things I haven't seen any other problems (major or minor). I seem to be getting a better signal on my phone and it seems to pick up wifi signals faster also and with a better connection strength. Overall I'm happing with the update but went back to lightning launcher as I wasn't too impressed with the touchwhiz launcher it comes with.