They're grippy, quiet and low rolling resistance.
After having big knobby tires on my electric bike, these are like a dream on the road. It's easier to pedal, turn and even stop. It even noticeably extends my battery range. I was able to make my roughly 30 mile round trip to work with a critically low battery when I got home. With these tires, it shows @10 miles of range remaining. That's more than just a minor improvement. That's huge.
Before I made the switch to these tires, I kept one in my pannier bag because it was folded so small. Hey, you never know when a flat tire is going to happen.
I just miss the rough trail rides.