I've always been impressed how well very old but properly maintained IGH 3 speeds perform. They really are tough and unlike finicky or temperamental derailleurs.

Currently have a project in the works with a new Shimano Alfine 8 speed IGH. Time will tell...

Derailleur-
As for other bikes and applications, do enjoy a basic 1 x 5 on vintage Bottechia but initially had chain drops when quickly shifting low to high range. Weaker spring design in the Campy Velox but solved the chain drop by adding a front chain guide. Now perfect. That bike can get caked of dirt on messy singletracks (knobby 700x32 Dugast tubulars) and it shifts without issues.

Dig the 1 x 11 for mtb. Flawless and quick.

And then there's the wide range odd ball 3 x 3 x 2. This one is a blast.



Fixed gear and 3 x 3 x 2


1 x 11