I had this phone for about a year. Good first impression on the slick and fast performance overall, the first problem I had stubled upon was the camera startup failure, which is happening until this day. Sometimes camera doesn’t start and the only way to fix it temporarily is to restart the phone. It’s very tedious if you need to use the camera quickly.
Other let-down is that you cannot add external storage - microSIM cards. 16GB model Nexus 5 storage doesn’t last long.