Cycle World reported that the shift quality on their long term test bike degraded. I wasn't sure what this meant until, at 16,500 miles, my shift quality degraded. Lots more false neutrals and missed gears. This is likely the more common circumstance than the ' full grenade.'
In my experience third gear was most affected. But , this means upshifting from 2 to 3 or , 3 to 4 as well as downshifting from 4 to 3 or 3 to 2. With the sliding sleeves, it is the gear change which is affected.
And who was it who said their third did grenade?
This web site is fast becoming 'required reading'. Thanks for the prompt answers to any questions posted.