I'll probably wait a few months before upgrading to Nougat if ZTE pushes it out. I've had bad experiences in the past with upgrading to newer versions of Android and my phone just not being as good as it was on the previous version. Whether bugs, crashes, it being slower, the battery life just taking a dive, etc. I think I'll just take the wait and see approach. I'm very happy with Marshmallow so I'm not that tempted to a first adopter.