The S300c has 190 hp, I’m not sure if this is enough to turn 4 blades. From an operator’s view I would be against it as each blade cost $14,000 and last for 5,500 hours. The dampers are extra too. From a pilot’s view it might be a good idea as an extra blade can store more energy for autorotations, however, if RPM is low, increasing the throttle may not increase the RPM quick enough. I have several hours in an Enstrom F28C and it was unforgiving if you got the RPM on the low end and then try to increase it with the throttle, it took a while, the S300c has a quicker response.