@vache am very pleased with this ROM, thank you. Stable, very responsive and fast (tops my S7 edge), and battery friendly with more than 5 hours of SOT (wifi on, low brightness level).
It needed some figuring out, but that's what worked for me (I tried to install version 0420 directly, cancel the setup process, and setup wifi and Google account later, but the phone never worked as smoothly):
1) install version 0403 and reboot
2) go through setup process until home screen is reached (don't think it would hurt to do additional setup work; not tested, though)
3) dirty flash 0420 and, in case you want root, immediately afterwards SuperSu v2.79-SR3 (no cache deletion of any kind at any point)
4) reboot and enjoy
As has already been suggested, it is advisable to install substratum and another theme as the System UI is difficult to read with the original theme (white on grey)
There is a negligible issue: boot process takes longer compared to other ROMs.