Originally Posted by moxfyre
Internally geared drivetrains have significantly reduced efficiency, increased weight, and increased cost. Derailer gearing is cheap, light, and works very well when well-maintained. So that's a trade-off.
Significantly reduced efficiency?. Maybe if you cleaned your derailleur chain everyday, it would hold some truth, but significantly is a rather significant word.
Also, how expensive is a Sturmey AW?
You have some points, but don't blow them out of proportion.