Glad to hear it! Mine still hasn't arrived yet but I'm very eager to give GrapheneOS a try. Tried LineageOS a few times over the years but when paired with microG it's barely usable, and with Play services I might as well just stick with stock.
> ... most straightforward ROMs I've used ...
ahem I believe GrapheneOS is an OS, and not a ROM... The project founder really wants you to use the "right" terminology: https://news.ycombinator.com/item?id=33567842 ;)