GrapheneOS user here, on my only phone, aka my daily.

I love my phone and when I replace it, I will be flashing GrapheneOS again. This is my second phone with it so far, and roughly year 4 or 5.

With that said, it isn't for everyone. I definitely remember some issues upon first install, a learning curve if you want to call it that. I also introduce intentional obstacles in certain "workflows" in my life that dissuade certain usage, like excessive social media use. With that said, I no longer remember what I introduced myself and what was an OS characteristic. I do remember having frustrations with most banking apps IF I didn't log into the play store mirror. Since I'm "hardcore" and am not willing to sign into a Google product on my phone, they just don't work. However I don't think they would be an issue for most people.

If you are on the fence, you can make a backup of your phone, try it out, and if you don't like it, you can reinstall the default Android and restore your backup. I've done it before when I used my previous GrapheneOS phone for store credit for my next phone, and figured they'd want a factory reset default OS on there.