I've finally updated from 4.1 to 4.3.3 back in June. Except for the wifi issues that has plagued me since upgrading to my first iP4 back in Oct 2010 (on my second one as of June 2011). I'm happy to say that I have not experienced most of the issues people have posted when they updated to 4.3.3. ie. texts being deleted, reminder alerts not not going off, or going off the amount of times you set it to, SIM card stops working, pics being blacked out. However, there are two issues that I am experiencing which is quite annoying. One, is the known issue of lags. Everything I do now, from unlocking my phone from sleep (I have to do a couple of swipes of the bar because the first time doesn't move it), swiping from page to page, launching apps, closing apps, deleting apps, and downloading apps, there is about a 1-2 second delay. The other is something that I've only heard of once, which is after a reboot of the phone, certain settings get reset to default. For me specifically, it's screen brightness, battery percentage, ringtones assigned, and sms preview. I've been having some issues with certain apps quitting on me (I have done the delete and re-download method for those apps, didn't work), and seems the only way to fix it for a little while is to reboot my phone. But everytime I reboot, those settings get defaulted. Just those settings, nothing else. Has anyone else experienced this? If so, did you ever find a solution? I've already reset and restored my phone twice, but still no fix. Thanks for the input.