Curious about gear boxes. Love the idea, but conflicting reviews. One local guy claims such horrid drag that he could not ride with his normal bikepacking buddy, while he could on his de-railered bike. While I know there are some measurable losses, I think he's likely just out of shape.
Toured with a Rohloff and absolutely love it. Have nothing bad to say about drag or shifting, it's bombproof and such a satisfying piece of kit for touring.
I just tried a touring bike with pinion gearbox and a belt drive. It was excellent! Wish I hadn’t.