I am using it everyday since December 2013, it's a great phone, my first Android experience and I love it! Still today, I can't find a good alternative to it. Samsung S6 and HTC M9 can't compare with its smoothness, style and Android stock experience. That's why I am still using it. I like the Nexus 6, but we are in April and in 6 months a new Nexus will arrive. I will keep and enjoy my Nexus 5 until then and keep this glorious Nexus 5 as a backup phone.
The Nexus 5 is the best value for money phone you can get (if you can get one), and one of those phone that worth to be kept.
Hope Google will partnership with LG again for its next Nexus phone. Until then...I have my great Nexus 5. Just waiting to receive the OTA 5.1!