I’ve had a FP2 for more than 4 years now. Initially it was great, durable, snappy and all around a good experience.
After the update to Android 7 came, some features I was using were lost (mainly the ability to deactivate a second SIM card even when it was in), and the WiFi started seriously misbehaving. Not only that but the phone was sometimes being extremely slow for a while, to the point where I was considering changing. I decided to first try LineageOS.
I installed 16 with microg, and immediately everything became better. The phone was snappy, all of the problems with WiFi disappeared and I was finally able to remove a lot of Google apps that I was never using.
This was, I believe, more than a year ago and it’s been great ever since. My FP2 is now more than four years old and I’m very satisfied with it.
This was about the software and the experience. When it comes to the hardware, I have needed to change the front microphone twice during these four years, once after a year and the second time was a couple of months ago. Could have been better but not terribly disappointed. I also had to change the phone case, the old one was in very bad shape after 3 years of use (the first year I used the original rubber one), but I’m not kind with my phone.
I don’t play any games or use any apps that need 3D, but I would expect it wouldn’t work that well for that use case. Otherwise it’s great.