iOS 9.0.1 is out, hot on the heels of 9.0

[Zoidberg]

I had a friend encounter the "nearly a brick" issue with the update, but he had skipped iOS 8 altogether on his 5S, as I recall. Went directly from 7.something to 9.0.

I've installed 9.0 on seven different iPhones (5S and 5c models) and iPads (iPad 2 up to latest Air, incl a couple of minis) and didn't encounter a single problem with any of them.