Quarx,You can download CM13 for Asus PadFone S/X from the link given below in download section.
Now coming to the bugs and stability report you can head toward the XDA Thread for updated logs.In This guide we are going to help you in How to Flash Cyanogenmod 13 rom in Asus PadFone S/X and How to Root CM13 in Asus PadFone S/X Step by step but before proceeding further make sure to full fill the below requirements for Flashing Cm13 in Asus Padfone S/X.
1.You must have custom recovery installed in your device it can me cwm or twrp recovery.
2.Your device bootloader must be unlocked.
3.Make backup of current rom before flashing the CM13 for Asus Padfone X/S
#How to Install Cyanogenmod 13 in Asus Padfone S/X
1.Firstly Download Cyanogenmod 13 rom for Asus PadFone S/X from below download section.
2.Also Download Gapps 6.0 for CM 13 and Super Su.zip for gain root access from below link in the download section .
3.Now place all the zip files in your device memory and boot your device in to recovery mode.
4.Now flash All the file one by one from recovery mode.Firstly flash CM13_nightly_rom .zip , then flash Gapps 6.0.zip and at last flash the superSU.zip file.
5.After completing flashing Clear the Cache and wipe data.
6.Now reboot your device normally.wait for few min as first boot takes a little time to boot.
7.Done! You successfully flash Cm13 android 6.0 rom in Ausu PadFone S/X with Root acces.