Joe, which version of the di2 are you looking at? Ultegra or Dura-ace? 10 or 11 speed? Stay away from the 10-speed dura ace, as it was the first version and not compatible with the newer 11 speed stuff. I have ultegra di2 10 speed on my felt Z3 and I love it. I am going to build up a new cross bike this summer and going to go di2 as well. I hate sloppy shifting from worn derailleur cables and the di2 eliminates that for me. I was changing cables 3X a year before then due to stretch. Don't worry about forgetting to charge the battery either, I go over 1000 miles on a charge, and even when it is flashing red like the battery is dead, I can still make it over 100 without a problem. I think di2 is awesome, but I'm not "old school." Look around, it hasn't taken a firm hold in the consumer market yet, so there are deals to be had. Givens its acceptance in the pro peleton, I don't see it going away in our lifetimes.
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