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@marcusjb
Quite tempted by the Gebla system and reading good reports on it. I have a co-motion drop bar shifter currently, and it is good, but I don't like having to move off the hoods to change gear.
The only issue with the Gebla is you won't know what gear you are in, whereas with the co-motion, I know I have X gears 'left' when climbing etc.
For the OP, Rohloffs are pretty bomb proof (poor choice of words with your photos above!). Internally they seem very robust and even if you break shifters etc., you can always change gear using a spanner.
They do take a bit of getting used to, there's a change between gears 7->6 (from memory) where you need to ease off as the hub will put itself into gear 14 to protect itself if there's too much torque during that change.
On the tandem, ours has not done starship mileage, but we are very happy with it. We use it with Gates Carbon Drive for utterly clean and low maintainence drivetrain. Squeaks a little in sandy conditions, but a blast of water over the belt and all is well again.