The Dura-Ace ST-9000 mechanical Dual control levers represent a considerable leap forward over the benchmark 7900 levers. Shimano has been hard at work to reduce both lever throw and friction.
Ive got about 200 miles on these and so far I love them. I love how the down shifting and up shifting is 2 separate pieces so when you go to sprint or to climb there isn't any mistakes made. Which would be the big reason I would go with Shimano shifters over Sram.