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Mercedes' Nico Rosberg took a flying start in Spa and led for a couple of laps.
The DRS and KERS systems raised many eyebrows during winter testing as they were deemed useless, if not dangerous.
With the F1 steering wheel already covered with many buttons, was it really necessary to add more? Absolutely yes!
The deadly combination has offered plenty of action and even managed to liven up the usually dull Spanish Grand Prix.
Some do not agree and underline that overtaking has been made too easy with the DRS.
There is no denying that drivers sometimes look like sitting ducks as their rivals shoot past them on a straight line.
1997 World Champion Jacques Villeneuve even argues that overtaking is no longer a braking contest.
Race organisers probably need to make a few adjustments to find a satisfactory balance. But at least the system works.
Nico Rosberg’s DRS was not active when he muscled his way past Vettel to storm to the lead of the Belgian Grand Prix last weekend.
All he had was a very heavy right foot and a big heart.