Hello,
here my experiences of 5 years and 30000km with Schlumpf.
My series M900 29 Schlumpf:
I got it new in Oktober 2017.
After about 6000km a crankbolt got loose. It was tightened with a torque wrench before.
After securing it with Locktight it happened no more.
In Oktober 2022 Florian changed the bearings at about 18500km.
Otherwise I had a few tube punctures and 3 worn out continental race king.
So no real problems.
My series 100 36 schlumpf with torquearm:
I got it in June 2019 second hand (not really used much) and modified it to 36.
At the beginnig the square tapper cranks at the mounting side always got worn out.
One time a I had to renew the crankbolts.
A modified sunrace crank broke in the middle.(lukiely i had just 2km to walk to work, were i was able to weld it.It was ok for riding 30 km home.)
Since modifying a spirit crank with a steel square tapper inlet, i hade no more problems.
The stealth rim got fractures at the spoke holes at about 9000km. But they are not getting worse.
In summer i changed the bearings at about 10000km. The outside bearings had to be fixed with locktight because the seat got to wide.
In November at about 12000km the planet carrier broke when i tried to shift up. I had to build a new one and hope it will last until my new schlumpfs delivery.
I had no punctures with the nimbus nightrider light. One time i grinded the profileshape round again.
So I think my game changer at unicycling is the geared hub. And in comparison of the two hubs I see the development to a reliable hub.