These springs are plated with 24K gold. The actuation force should be similar with a more springy response.
55g are extra light springs. These are lighter than your Cherry Red springs.
Light Springs are 62g. The light springs are similar to Cherry Brown and Red springs.
Medium Springs are 68g. Like what it sounds, it's the medium between light and heavy. You get a feeling of the Cherry Vintage Black in a lighter touch.
Heavy Springs are around 72g. The heavy springs are close to Cherry Vintage Black springs.
Extra Heavy Springs are 78g. The springs have a resemblance to stock Cherry Clear springs with a much softer feedback (by ~25%.)
Disclaimer: Gold Springs might reduce the life cycle of the switches by a little.