I haven’t used Genevalle. I know they use Microshift shifters. I have used Michrshift bar end shifters as well as their thumbies on different bikes.
They are crisp and precise. On my old Voodoo I mentioned upthread, I used their bar end shifters for 1x10. They were pretty good. I don’t recall ever having any issues and I ran them indexed. I never used friction.
The Genevalle are ugly but I smacked my thigh on my shifter kind of a lot with the bar end style. I also found spots off road where I couldn’t shift. I should have gotten them back then, in retrospect.
The only downside is that you are basically stuck with their levers. That’s a pretty minor problem though.
If I had a mechanical shifting gravel bike, I’d get their hydro lever setup before Shimano or SRAM for sure.