I got to try out Di2 recently and I must say I was floored by how much better it was than anything else out there. Shifting on the drops just requires you to extend your finger and tap the button. No need to bend your wrist all funky and you don't have to worry about adjusting for the occasional chain rub on the FD. I prefer SRAM to Shimano when it comes to mechanical drivetrains but Di2 is just above everything out there. Also price is not as prohibitive as people say. You can buy an entire Di2 group for $2500 at PBK which is around the same price as SR11. If you already have a bike with DA7900 or new Ultegra 6700 the upgrade kit is $1500.