I would think that with the A7 chip the 5S would be able to handle anything thrown at it for the next 2 or 3 years. The more they keep talking about larger iPhones the more I'm not sure I'd want one too much bigger. I had an iPhone 5 since launch day, and it was a great phone. I gave in to the temptation and bought a Galaxy Note 2, and used it for a few months. Occasionally I'd switch back to my iPhone. In the end I sold my Note 2 on ebay and then Verizon offered me a good deal to upgrade to the 5S back in November. Recently I let my work add me to their AT&T account and they gave me a new Moto X. It's a great phone and I occasionally swap back and forth with my 5S. To be honest the Moto is about as large as I think I want my phones to be. I can use it one handed and that's something I missed when using the big Note. I wouldn't mind seeing Apple go a little larger, but not crazy big like the Note line or similar. All of that long winded post comes back to my first point. The 5S is a powerhouse phone that will serve anyone well for the next couple of years. Unless you're wanting the bigger size I'd recommend anyone go for it and take advantage of some cheaper deals right now.