Is R80 stable?
Several measures were taken to have R80 more stable than any major version that we've had before:
Prior to GA we accompanied over 150 customers with their transition to R80, and incorporated all of their feedback.
We changed the way we verify the quality of our daily builds. Automatic processes have been running after every feature change to R80 to check whether operations do not get affected, including: upgrades from R7x, install policy, multi-admins work, logs-to-policy-management integration, multi domain operations, HA synchronizations, objects creation and more.
We hope that the Upgrade Verification Service can assure your confidence in R80 over your environments.
Another thing worth noting is that R80 is a Management-only release, therefore Gateway operations do not get affected by this upgrade.