I know I'm in the minority, but I had mixed feelings when I test-rode DI2. Yeah, I liked the precision of it and I liked how I could shift under almost any circumstances, even when I did deliberately stupid stuff like shifting under load on a steep climb. But there was something about the ***sound***. DI2 has a sharp *kthunk* sound when it shifts, and good well-adjusted mechanical shifts are just those soft clicks.

I think I would appreciate DI2 more over time, as mechanical derailleurs drift out of alignment and need to be readjusted now and again.