Having been so delighted with the Nexus 4, I ordered a Nexus 5 from the Google Play store on the day it was launched. When launched it was a massively powerful phone, and at £340 for the 32GB model, competed head-on with the Apple iPhone 5S which was nearly double the price (£630) and exceeds it in most respects.
After the Nexus 4, the big bright 1080p screen was a dramatic improvement, and it certainly felt quicker, but it also feels cheaper after the lovely glass body of the 4, and I certainly wouldn't want a phone any bigger than this. Battery life remained disappointing although the Lollipop Android update in late 2014 improved this.
The official LG Quickcover transformed the phone. If you get one of these, you can change the screen timeout to 2 minutes or more, because when you flip it shut/open it controls the screen, which is very handy indeed. It also works with the handy wireless charger.
Update June 2015 : The phone remained fast until the end, despite approaching 2 years old. The end you say? Yes, I dropped it while getting out of the car. Just about 2 feet, but it was enough to smash the super-fragile screen. The battery life had also become fairly appalling by this point. This fragility, and the poor battery life, has reduced its score.
3.5 marks out of 5