I usually upgrade every other release, so I guess it's about that time.
Has anybody made this jump? i'm mostly concerned about performance and video since I tend to do a lot more gaming these days. Is the performance increase between 4s and 5s that noticeable?
I made the jump from the 4S, and I still don't regret it.
I was one of the people who thought "That's nice, but I've never had any real performance issues with my iPhone." And then I got the phone and I'm just amazed at how smoothly everything runs compared to the 4S I previously thought ran decent enough.
The screen size was another thing I balked at when the 5 came out. "Oh wow, an extra row of icons! Glad to see you aren't phoning this one in, Apple." (SEE WHAT I DID THERE???) I want a larger screen. A wider screen. And to this day, if Apple were to announce a wider-screened iPhone, I'd still go and get one. The difference is, now I no longer say I "need" a wider screen. The 16:9 aspect ratio, combined with the design of iOS, really gives you everything you need from an iPhone display. And it is nice having a phone that fits comfortably in your hand.
Now I realize I'm going to sound like a fanboy, so I'm going to throw in some critique: Contrary to what Apple wants us to think, that extra inch of space on the screen does make reaching things on the top of my screen with my thumb a little awkward. I have smaller hands, which makes typing on my iPhone great, but not so much this. With that said, it's nothing I can't overcome by holding my phone a little differently. I barely notice this issue so much anymore.
I also really wish Apple would've wow'd us with the battery life. Don't get me wrong, the battery in the 5s does a great job... for a smartphone. But with Motorola claiming their new phone gives 24 hour battery life, even if they're off on that number I'm sure the actual results are still impressive.
Overall, this is a very solid phone that (thanks in part to the A7 and M7) will last many iPhone users a long time if they don't want to keep upgrading.
Get a 5s.
