I’ve been using it for years and I think it’s great. Currently on a 6 Pro. It’s true that some apps don’t work without Google Play services, but GrapheneOS has the option to install the google stuff in a sandbox, so you shouldn’t run into any issues if you do that. Personally, I don’t use Play services unless I need to, and use Aurora store for any apps that aren’t on F-Droid.
In any case, you can always revert to stock or try another OS
Edit: as faede has pointed out, it appears that Google Wallet has issues. Also, the usage docs mention issues with banking apps in general, so that’s something to consider
Try going down the page and looking for the categories with more than a few bits of identifying information. I’m running LibreWolf with just uBlock Origin and Dark Reader (which I don’t think influences results) and I’m able to get nearly-unique, instead of unique (but I do get unique on default settings). TBB gets non-unique, which is a good set of results to compare to.
In my case I noticed that my fonts were really unique so I set browser.display.use_document_fonts = 0. Also I use my WM to set my page resolution to 1920x1080, which seems to have a better fingerprint than the default LibreWolf floating resolution of 1600x900 (and even the letterboxing resolutions, from what I can tell).
I just spent some time testing again and checking for anything else. RFP does force a generic user agent, but unfortunately it keeps the version information and I can’t figure out how to change it with RFP on. Would be nice to set it to the ESR version used by TBB (which has lower bits), but I’m not sure if that would lead to a more unique fingerprint (if, say, a feature was detected that is available in later versions but not ESR).
Edit: just tried Mullvad browser, and it’s non-unique! Might be the best option.
I have this device and use it to store my keepassxc and onlykey backups, and it’s useful to me because I’ve stopped using passwords (I only need to remember the pins for these devices which can unlock my keepass dbs that have everything else).
It seems secure enough for my use case, especially since the files I store in it are themselves encrypted (the onlykey backup still requires a pin), but I still want them to be difficult to access.
I’ve had to rely on it before but only because I didn’t prepare a backup onlykey ahead of time- ideally it should be one of many recovery methods. But so far it’s worked great for me.