Originally Posted by DaveWC

There's nothing to wait for with either electronic shifters or computers as far as I can tell. I get on my bike, turn on the Garmin & start pedaling. The shifting works immediately and the Garmin will find the satellite whenever it does. Neither prevents me from riding right off the bat.

The thing that I can't understand is that the vast majority of people who have negative things to say about Di2 (or any new technology for that matter) have never owned it or tried it for any appreciable amount of time, yet they know all of the things that they won't like about it. This is a good example... you have to wait for 20 minutes before riding a bike with Di2. The charging issue is another funny one. I've had Di2 since last September, have 9,300 kms on it and have charged it 2 times. You can check the charge in seconds, it gives plenty of warning well before you need to recharge, and even if it bonks it diverts all available power to the rear derailleur allowing you to get home with reasonable functionality.