The SL series is best suited for riders that have been riding traditional road bikes. They are meant to be primarily powered more by the rider than by the motor. They have a wider range of gears allowing less boost to be used when riding hills. Not to say you have to be that type of rider, but it will have as shorter range if you want to have bike do most of the work.
It is the perfect bike for me, having been an active rider for 45 years. I ride in eco mode 99% of the time, which I have set to 20%/40%. I get 100 plus miles on a charge. My rides are typically 34 miles with 2,500 get off climbing. I'm 74 years old. With my eco mode set as above it requires about the same effort as my regular road bike. I prefer it to my regular bike for the upright position, wider tires(softer ride), rack with bag to carry things, fenders, kickstand and the ability to continue riding into my 80's as I age. Currently I keep the boost low to be the same as my other bike so that if I ever up doing a hard ride that is not appropriate for e-bike, such as a club ride, I don't get dropped riding my regular bike.
If you want a bike that provides more of the power than you, this is probably the wrong bike (unless you always do short rides). Just my 2 cents.