I've been shooting revolvers in competion for a lot of years, and I wouldl not call these "upgrade" kits.
They are specialized spring sets for people who are more interested in the lighest trigger pulls for range use, and not do much interested in maximum reliability with all ammo for defense use.
Second point: grabbing a handful of aftermarket springs and tossing them into a revolver is not optimum and often not productive. Suggest you get Mr Miculek's excellent videos on revolvers and look at what it takes for a full competition setup. First comes the fitting and smoothing, and then selecting springs for the purpose at hand.

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Science plus Art