[wrxtasy]

Would S905X3-based be any better than the current S922X-based N2? Isn't latter a better performer?

The S922X in the N2 is a faster SoC, no performance gains to be had by "upgrading" to the C4. 

Yep - the C4's advantage is that it's £20/unit cheaper I guess?  (Hopefully it will have a better reliability record than the N2)

I doubt the N2’s reliability was better or worse vs any other mainstream Kodi hardware.
But boy did we sure hear about it from vocal users !