I have read literally hundreds of posts on this subject. It all boils down to what you are really looking for. The Z51 option gives up some ride quality (albeit IMO not much over stock) to gain better handling characteristics. The F55 MSRC provides the ultimate in ride control but does not provide the Z51 level of handling. The Z51 also provides different Manual transmission ratios - which I like - and additional cooling - which is moot for me since I don't track the car.
Do yourself a favor and decide what you are looking for and then compare the two by test driving if at all possible.
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2006 Machine Silver Z51 Convertible
DTE 415ci LS3 Pfadt Coilovers RPS Clutch Stoptech lines Z06 Exhaust DTE 4.10
510RWHP 472 TQ
Interior by Down South Vettes
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