I've ridden a couple of Enduros with the Rohloff & also the Builth Wells round of the Merida series with Derailleurs for comparison...derailleirs were fine 'til we hit a very muddy section, gear changing was v. unpredictable...riders were cleaning their bikes in the streams to get their gears functioning again ! Rohloff is the future now, it does take a little time to adapt...another great thing is when riders in front force you to stop on a technical section, you can just change gear whilst stationary & pedal off!