Apple has a culture of excellence that is, I think, so unique and special.
What has surprised me most about the iPhone 5S is that I have not missed 5-inch phones as much as I thought I would. I sometimes struggle juggling bigger phones while on a train or bus so it’s been a bit of a relief stepping down in screen size. That changed since I lived with the 5.5-inch LG G3. That phone looks like a tablet compared to the iPhone 5S but manages to remain easy to use because of clever ergonomic design.
There’s is not much to say about the iPhone 5S’s performance here other than that it’s blisteringly fast and very reliable. I’ve not experienced any issues with apps misbehaving other than the Google Maps hanging occasionally. It’s annoying but may be as much down to the app as to the phone.