[fuzzylightbulb]

Not needing to route cables (or wires) along and/or through the bike frame is a huge improvement. Anecdotally, everyone I know that has adopted Di2 seems to love it. The cost of these systems is negligible for the type of buyer who is shopping for high-end groupsets.

[raoulj]

Counterpoint - the benefits of wireless are there but the worry of your unit dying in the middle of a ride now replaces the concern of whether your derailleur is tuned and ready to go. It's easy for a shop to assemble, but now I'm worried about shorting the control unit of my di2 which would be a pricey fix. I have two bikes: one with and one without di2. Both work just as well and one costs much more.

I do love disc brakes though.

[cheeze]

You're talking about charging... monthly? With a system that gives clear warnings early that you're low on battery?

I'm already charging my GPS, headphones, bike lights, etc. regularly. This has been an absolute non-issue to me.

If the battery lasted for 100 miles, sure. But I'm getting ~1000 miles a charge.

[mauvehaus]

Honestly, routing the cables through the headset introduces so many tight bends, I suspect you'll get better long-term reliability with wireless. Plus, there are no connections to make waterproof aside from the battery.

[conradev]

My Di2 is wired internally but can communicate wirelessly, which I really like. One charger and one battery for everything.