Tried to, but then my phone stopped working and went into recovery mode.
First I tried to do it OTA and then it said "plug in for at least 50% power" and then trying to re-do it in iTunes -- it got caught in an endless loop of "unknown error (17)" and now I'm stuck. Just got the iPhone 5S, and less than 24 hours it's problematic.
Edit: fixed it with tinyumbrella
Didn't go through with 7.0.1 upgrade yet.
Edit: 7.0.1 installed itself without me prompting it -- I had downloaded it but held off on the install, and today it just did it for me. So far so good.