I've run these for a good few years - being able to adjust gear indexing on the go is of massive benefit. That and knowing how much battery you have when you jump on the bike. And what gear (suffer level) you're in.
Charge port and 3 port junction additionally. Winner!
Cheap display at half the price if you wish:
https://www.chainreactioncycles.com/p/shimano-xt-di2-mt800-system-display
£67.99
I've run these for a good few years - being able to adjust gear indexing on the go is of massive benefit. That and knowing how much battery you have when you jump on the bike. And what gear (suffer level) you're in.
Charge port and 3 port junction additionally. Winner!