Wasn't this all about gearboxes?
I have just read a 50,000 km report on the GS - and they did have a gearbox fault on this bike - but the various testers tend not to bother with the clutch. BMW replied that a BMW box cannot be hurried (don't we know that!) and pointed out that this gearbox had now been fitted to 50,000 bikes, around 60% being GS's and had proved very reliable.