well is seems to work ok. Maybe a little bit slower than 10.3.2.
I had some problems though. After the post-installation process the 5S was stuck in a loop and I had to hard reboot the device. In the mean time I was installing my MBP with MacOS 10.13b which required a second factor from my iPhone, which was stuck in that loop...
But somehow it revived again. and both work fine now.
It seems (I have to verify it) that with low battery (<15 % red battery icon) the 5S becomes super slow. I had to (hard) restart it, and every time after first unlock of home screen the phone became unresponsive resulting in black screen with "hour glass" and finally rebooting in apple logo.