Before revision:  Human assessment by domain experts shows that 41.7\%-70.5\% of the comments generated by ReviewRobot are valid and constructive, and better than human-written ones  20\% of the time.
After revision:  Human assessment by domain experts shows that 41.7\%-70.5\% of the comments generated by ReviewRobot are valid and constructive, and better than human-written ones for 20\% of the time.