I have to say I've been impressed by the Shimano Di2 wired system as well as SRAM's eTap. This to me takes the best of both groupsets; offering up the battery life of the Di2 kit with the wireless system of eTap. Let's get this on some CX bikes! It's waterproof and offers ANT+ BT integration for smartphone access-- no need to drag the laptop out to the garage to do updates and adjustments. This will be my stoke for next month's Interbike.