So I reset my iPhone 5s and set it up as a new iPhone instead of doing an iCloud back up restore. I still have all my pics and contacts. I downloaded all the usual apps I use. From Facebook to Instagram to Wells Fargo. (I have more apps then that.) Everything so far has been working smoothly. When I first put iOS 8 on here I had bugs galore. my settings app has force closed on a couple times. Other then that iOS 8 is running great.