I was going to mention these units, I have them on my dual suspension.

Thread drift below.

I may be the only person who likes them. I got them as a package with Sun disc rims, disk rotors, plus the hydraulic shifter-brake things. They shift great and are easy to use. I understand they were hated due to the ease of accidentally shifting while using the brakes, especially in bumpy terrain, but I’ve never had that problem. As well and on my regular XT shifters where the R thumb goes to bigger cogs, my thumb gets tired pushing the lever, possibly as I’ve had assorted sprains, dislocations and other thumb injuries, so the dual control things work great for me.