First of all I would trust any google device .The nexus 5 is an ideal mobile for any developer
it can . I brought because of the good specs and the light weight build . Mine got an upgrade to marshmellow but still works better it dosnent slow down like the iPhone 4 after upgrading
I sold my iPhone 4 to buy nexus 5 . I love android now . it has been an amazing experience for me. there have been no lagging like other non google oriented phones .the audio is good
the clarity of the screen is amazing . The google music player is mind blowing . it is amazingly very light in your hands . it is not heavy like other phones