i think anyone should be cautious of a 1st gen sram product (or any product in the electronic realm, really) -- i know some will jump on board quickly with the hope that the right testing has done.

i'm curious to see if/how they'll get around having a battery in every component of the system, requiring separate charging or replacement.

wires are a hassle for setup, but once that's complete it's really a non-issue. there is the weight of the wires (fairly negligible...the new di2 wires are about 5g per), which could be offset by the weight of additional batteries in a wireless system.

also, i wonder if losing pairing could ever be an issue. i'd sure be curious to see/test it, though.