1) Few apps are disappearing ex: myVodafone app, found it difficult to top up after the IOS update? 2) It has f***ked up the Music library, UI part looks uber cool, but when you play a song and slant the iPhone a bit you would notice the screen turning off and the song going on to the pause mode, its often noticeable when you drop the phone in your pocket and turn the music on. 3) The phone is getting heated when charging (only slightly) 4) Google and Twitter provided some immediate updates after IOS upgrade, I am not sure their update are for the 3D touch alone. 5) Apps using 3D touch has improved with more options but nothing noticeable or a major shake up. I was expecting some back button feature for youtube app, in IOS 10. Its a bare necessity that has been there with the Android for ages, but not with IOS.