Originally Posted by CliftonGK1

Durability on the Novotec, Sanyo, and lower end Shimano hubs isn't the concern with many dyno users; it's the mechanical drag. For a commuter bike it may not be much of an issue. For a randonneur it can become a huge concern, when additional drag might decrease a rider's speed by 0.2mph.
May not sound like much; and on a 1hr commute is really isn't. Applied to my own commute, it's the difference between 1 hour (at 16mph avg) or 1hr 0m 45s. Over the course of a 40hr brevet, it becomes 30 minutes, which could mean the difference between a 600k medal and a DNF.