Because my iPhone 6 on 8.4, i was needing the support of my workhorse, my iPad rMini. I put ElCapitan on an external SSD on a Mac, and had iOS 9 on my iPad Air 1 and loved the interaction between the two. Both os's were reasonable stable, well useable so I updated my rMini to 9. Little did I realize how much i depended on that device and my iPhone working together. Luckily i backed up my rMini properly and was able to go back. I do like the new features of iOS 9 and cant wait for the public release. I just cant even think about doing anything to my iPhone liked using it for a beta tester. I just need it to work too much. Lol. Coward? Maybe Anybody else afraid to mess with a good thing?