when i had one of those button clutches, it was not the clutch i was worried about with the shudder, it was the whole gearbox and driveline, diff .
Jarr's the crap out of the whole driveline, im sure if i left it in for long enough and slipped it long enough i was looking at a gearbox rebuild, took it to a gearbox shop and they laughed and said, mate thats not a clutch you want for the street!