There is I think a big difference between a 2015 and 2018, I can ride up any hill around here with no pedal assist whatsoever, just a touch of the throttle, I use the manual mode more than auto and shifting to a lower gear is super easy, simple twist with finger and thumb, I have the electronic shifting on my Aurora so no muscle required. The new one is also 750W and 90NM of torque so I don't think you'd need more. I have ridden mine on flats with no power and its fine but a steep hill would be tough. I don't notice the weight of the bike at all when riding. I also have a Trek with gears and it sure beats all the chain popping and clunking , these new auto hubs are Great!