45 K on the C, no coils but it was running rough on cold start and missing some on acceleration. Had the dealer check and found no codes. They agreed something was amiss and fooled with it until someone at PNA admitted it might be a dirty fuel rail since it dead ends and there is no return. They did the fuel system clean and it solved the problem. Warranty covered it.
40 K on the CS and no coils.

 

04 CV6 14k miles; no coils

 

05CTT, coils @ 40k km. dont know if prior owner had problem.
warrantied though

 

2005 Cayenne, 30k miles, no coils yet; haven't noticed any symptoms but given the info in this thread, I'll start to monitor it more closely.

 

75K miles.. Didn't notice any symptoms. But, after reading this thread, bought 8 coils and plugs and replaced them just to be safe. All 8 coils were cracked badly. It runs much better now, like night and day. Even my wife notices the difference... I would have never thought about the coils if it weren't for Rennlist and members.. Thank you all!

Cost of parts (8 plugs and 8 coils) - $330
Labor (local shop) - $90
Total Cost - $420
Value of Rennlist.com - Priceless