Been using my FP3 for a month now, have just sold my old phone so I guess I’m committed to it 
I can echo the previous comments about the large size of the phone, but to be expected with the modularity. No problems with performance and all my apps loaded just fine. Battery life has been good - usually down to 20 or 30% by the end of the day, and I regularly go a whole weekend on a single charge. I use Nova launcher, so never had the “white search bar” issue. Screen brightness is fine for me, however I do find that the lowest volume level for ringtones & notifications is too loud for the office environment. No problems with calls, wifi or mobile data (I’m on EE in the UK).
The only negative things I can say are that the screen is not as sensitive as I’m used to (sometimes have to press twice, or harder, especially near the edge of the screen), I once had the problem where the headphone socket squealed when inserting my headphones and then did not work (fixed by restarting the phone) and a couple of times the Bluetooth connection to my car hasn’t worked properly, usually at the end of the day (fixed by restarting the phone). Oh, and there’s no NFC toggle in the pulldown menu (I had to use a 3rd party widget for this).
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