Android 6.0.1 Problems
You should also know that there are a number of Android 6.0.1 problems plaguing Nexus 5 users.
Android 6.0.1 fixes several annoying bugs but it also brings some problems of its own. Nexus 5 users are running into all sorts of trouble after installing the Android 6.0.1 update and the number of complaints continues to grow as we push away from the release date.
As we've noted, early Nexus 5 problems include broken voice calling, issues with the proximity sensor, problems with the Play Store, problems receiving and sending MMS messages (the update was supposed to fix these problems), and problems with sound. The Nexus Help Forum is full of complaints.
It's important to know about these problems before you install Android 6.0.1. This is also why we recommend doing some prep work before you install Android 6.0.1. At the very least, backup your files. This way, if you do run into something, you'll be ready.