Mercedes-AMG F1 W09 EQ Power+. Pic Courtesy/ formula1

It's the most controversial Formula One introduction since the 2016 qualifying elimination clock, but unlike that ill-fated change the halo should last more than two races. The new cockpit head protection system, to give it its full name, is highly divisive: team principals, drivers and fans are split over whether it is the right safety solution when the new grand prix season roars into life in Melbourne this week.