I had an electric cargo bike with a nuvinci, since it was the only option with a belt drive. It works for that application, shifting under load is a nice thing

I had an electric cargo bike with a nuvinci, since it was the only option with a belt drive. It works for that application, shifting under load is a nice thing when going up the hill with a heavy bike. But the downsides are pretty big. It’s lossy, so riding the bike without assist was tedious. The gear range is tidy, so I was always missing some on the upper end. I picked a different combination for the next bike.