FP1 - I wanted it for the good cause and the dual SIM. Well, spare parts and OS-upgrades was a huge deal too. It is (still using it) my first smartphone. The day did come though when I had to put my “work” SIM in a second “work” phone because of software compatibility, security and power. But my personal SIM is still in the FP1 and it still do everything I need - though a bit slower.
My FP1 has been with me on adventures - its been humid, warm and cold conditions and the phone has sometimes complained about it. Because of this it has marks here and there - but its mostly charming. The white plastic frame kan take serious beating.
The FP1 I use now is not the original I bought, the first one was soon showing it self to be totally messed up but the company replaced it very quickly. I have also had to replace my battery once and I love the fact that it has replacement parts and planned security updates.
Comparing it with a new phone i only miss computing power, and I am a bit annoyed that I found no software to manually control the camera. I hope the app compatibility will stay strong for time to come. I wish I could also control things so increase battery time.