My 11 speed Di2 has fast, reliable front shifting. So much easier than the full throw of mechanical front shifting. And it does an auto trim in three steps as the rear is shifted through it's range. It's really the key improvement over mechanical shifting. (along with using any finger to shift the rear!)


I suppose that's not as important on tandem, where both riders have to be ready for a front shift. On my single bike, I might shift the front at the last minute for a 25 foot hill, since it's so easy.