I did not work on our website, I tested it yesterday.
We are thinking about rolling back to 5.6 even with the performance losses.
Many plugins are having strange issues with PHP 7.
Wordpress is recommending 5.6 and probably won’t recommend 7 until mid 2017.
So if you can live with the slow performances of PHP 5.6 I would suggest staying on 5.6 until WordPress recommend PHP 7.
Which should force many plugins to really test for 7.