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Robert,
Perhaps slightly better performance and the proper match for the 987 MAF diameter; folks here are actively using it. Full disclosure: I have just changed from a third party tune to the stock 986S and planned to go to the 996 ROW. I am not sure about the anniversary tune and don't know anyone using it. I believe the anniversary is geared to the 68mm TB where as the 996 is geared to the 74mm.
You will: be able to start the car without depressing the clutch, reducing engine wear;
not have to worry about post cat o2 sensors/codes; loose the ability to monitor one cam shaft for deviation from ideal.
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986 00S
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