Thought I would give you guys an update on iOS 9.1 beta 4. I installed it yesterday afternoon and I must say today the phone has been operating so smooth I'm not sure if it's smoother than yesterday afternoon because it took time for things to settle down or the so-called indexing phase to finish. Everything just seems so fluid and smooth on my iPhone 6s I'm really pleased with how this iOS is turning out. There are a few bugs here and there but the fluidity of the operating system is so much better than I've ever seen it including iOS 8.4.1