Supercharger kits are essentially the same, they provide a compressed source of air to the engine. They will have their subtle differences but ultimately the tune will be the biggest factor in long term reliability of the S65. As far as the kit goes, I haven't read of any kits that failed due to design error. They all seem to be as reliable as the next one. Components can fail at any time though as you are introducing boost into a high revving race engine stuffed into a street car.
My 2cents
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