My mate has just had one done on his 02 996 BP and we were talking about this last night..
Rather than have the 12000 service he had the 6000 service done (oil, filters, fuel filter, air filters, shims, chassis bits, cluctch stripped and cleaned, brakes checked, TPS reset, emmisions checked (think they called it CO's?) charging system checked, battery load tested etc.... but 'upgraded it' to include replacement belts. (no extra labour as they should take them off to inspect them anyway!) so just the cost of the belts (about £60 i think)
what isnt done... Replace brake and clutch fluid and replace fork oil. Which is a waste of money at 10,000 miles anyway.
cost £425 including the VAT (which dealers always quote excluding!
Official dealer, book stamped, workshop report sheet with all the things measured and recorded.
They found and replaced a blown tail light bulb, and, it now runs perfectly (turns out it had the wrong chip in it! which they spotted after the test ride, £35)
i'm sure others dont like paying for the 12k one when this seems to be perfect ????