My 5S has served me well with 32 GB, especially now I don't store music on the device and just use cloud services. Used: 23.6 GB, free: 2.7 GB. Photos still take up a big chunk (but iCloud helps here), and I tend to remove games that I'm no longer playing. That being said, I've got a 64 GB 6S on the way, so the extra space will be useful I think. I can imagine some newer games getting even bigger and it's a nice safety net to not worry about running out of space.