Testing this shifter on my Luna Buzzraw and absolutely love it. It’s a wireless shifter like the expensive ones from SRAM and Shimano. Super easy to install and you tune it with an app on your phone. Works with practically any derailleur. Biggest issue anyone will have is where to mount it. Batteries are rechargeable and you can set a “get home“ gear if they do run out on you. You have to turn it on for each ride but once set up it pairs easily with the handlebar remote. Shifts are quick and smooth and you can fine tune each individual gear via the app. I have a custom setup using stacked Surly Single Speed Cogs due to the power of the bike and this wouldn’t be possible without the D1X as there was no way to prevent the derailleur from over shooting the last cog. Battery life is yet to be determined but so far after five ten mile rides they still don’t need a charge. This is definitely going on my Hydra once it gets here.