Originally Posted by
Seattle Forrest
Serious answer, about Di2. It shifts really well, probably not better than a well tuned DA mech system, but not worse either. Unlike mech, it never needs adjustment. Your Garmin can show you where you are on the cassette so you don't have to glance down, other cool integration stuff too.
If I went back to mech the biggest annoyance would be the trim. (Don't tell me about yaw FDs, those are crap.)
Why do you say Yaw FDs are crap? I have one and it shifts really well and smooth without the need to trim it. It's a PITA to set up properly, but once done it's set and forget.
Regarding the Garmin and cassette position, when I've been riding a bike for a while I know the gear I'm at by feel. I never look at the cassette when riding my bikes.