the fix on the RMS failures were to replace the entire engine (which they did) on every car effected. that problem also only came about on the Mk1 996's. the intermediate shaft failures happened when there were at least 80k kilometers on the engine and again those problems were fixed. the cylinder liners had occasional bad batches, which every manufacturer deals with. the PCCB issue was also solved quickly and without cost to owners. the people that replace with the steel disc for track use do so because they don't want to spend the extra money on the composite discs because they are expensive. if you're constantly tracking a car you sometimes want to save money and thats a very easy way to do it. when it comes to modern Maseratis the one thing that jumps right to the top of my head of problems is the clutches that only last 5k kilometers. regardless of how you drive them, the constant fit and finish issues, and (in the early models) the piston ring failures.