I think this was the tool that was happily reporting copying my files over to a USB stick despite there being copying errors (for which it didn't check, apparently).
Left me puzzled with regard to why copying over a new image still led to the older one booting for a while.
Switching to a different USB slot (2 VS 3) solved it, iirc (and I think I never used Rufus again).
He is right though, watermarked w10 has no time limit, and comes with what seems only a few limitations, like inability to customize the taskbar location, for example.