The 40% increase in power was been discussed here from 15 ES to 15 Mark II but I don't quite understand how it's possible if the motor is the same. The description on Autogeek says the power draw is the same but it "feels" more powerful. I don't doubt that it feels more powerful, but how much more powerful can it be with a very similar motor as the outgoing model?
Autogeek's description that it "feels more powerful" is both accurate and inaccurate...
Yes it feels SIGNIFICANTLY more power because IT IS SIGNIFICANTLY more powerful.
The confusion is because tool makers and tool sellers (since very few tools are actually made..) in the USA have attempted to draw a correlation between watts and actual power.
Watts is a measurement of how much energy the tool sucks off the grid just like MPG is a measurement how how much fuel (energy) your car burns to move down the road. At least with MPG, the EPA has designated certain standards to allow measurement for comparison. If you idle around in high gear at 30mph on a downhill slope you will generate a very high fuel economy rating. If you run it full throttle in low gear up a hill you will generate a few low fuel economy rating.
Wattage is similar... If I run the tool under very light load it will pull very little energy and thus have a low watt rating. If you lock the spindle of the tool and run wide open it will suck a huge amount of energy off the grid and thus have a high watt rating. The problem is that there is no standard for power tools, and since marketing tells people that a high watt rating is better (this is the same as marketing trying to convince people that a low mpg rating would be better) some creative techniques are used.
In fact, a lot of power tools will claim a high rating, but under full load they cannot pull anywhere near there claims.
Both the legacy BigFoot Polishers and the MKII Polishers will pull a maximum of 500w under high-load, but pull significantly less in most situations. However, the difference is torque (twisting force or working force) is different. The MKII produces 30% more power torque while drawing the same energy as the legacy.
Imagine we have two cars, both which get 20 mpg city (watts). However one produces 200 lb of torque and the other produce 260 lb of torque. Both have the same energy consumption rating, but one is more powerful. I would leary of a marketing company that tells you that a third car, with 10 mpg and 200 lb of torque is better cause they burn more energy.