Frederick G.wrote a review of Shimano Dura-Ace ST-R9100 11-Speed STI Shifters on March 8, 2018
Familiarity: I've put it through the wringer
I used a DA-7800 10 speed for quite a few years. Let me say this, the 7800 was the foundation of the mechanical DA 9100. With that said, the 9100 11-speed FD and RD has the ability to be trimmed to a perfectly silent "transmission". This is by far the quietest setup that I have had as a mechanical. If your considering upgrading from 10-11 speed and you are interested in the DA 9100, go for it! you won't regret it.