I know we're a while away from iOS10, but this is on my mind. I am not a regular phone upgrade. I had my iPhone 4S for more than 4 years, and by the time I hit iOS9 the phone was all but worthless. I have two old 4Ses about the house and they work fine for Plex and Overcast, but as a daily driver it was terrible. I now have a 128GB 6S, and it is amazing. I would like to keep it for 4 or 5 years. Is the A9 processor and 2GB RAM now so powerful that I should upgrade without a care? It's almost a desktop class processor, and 2GB RAM is ok too. I know this is pure speculation, but thoughts appreciated.