Mine is remapped. 58k later on standard clutch and no problems at all.
 
Doubt you'll get clutch slip on a mapped PD100 unless the clutch is seriously knackered.

The judder is from the dual mass flywheel. Your still going to get this with an uprated clutch.
 
Thanks for the replies folks. This judder I get is when the clutch is almost fully let out in first secod and sometimes third. Car only had 21000 miles! So you recon this is thr flywheel and i that a bad sign?