Yasaka Rakza X Soft

Unnecessarily large amount of force has to be exerted for a very low increment of result/feedback. The sponge suppleness actually works against control in many scenarios since there is almost no support. If one chooses to use this rubber for some reasons, a stiff and bouncy blade is recommended.

There are two utilities for this rubber I can think of. First, it can be a good tool to learn spinning for very beginners due to having a grippy topsheet with almost no bounce in the sponge. Even though the actual spin is at best average, the feeling of spinning the ball is commendably clear. It also has a convenient upgrade path to the regular version: retaining the same feeling from topsheet and adjusting only to a harder/bouncier sponge. Second, it can aid transition to stiff blades jumping a long way from a soft one. Other than that, even multiball feeding and defensive purposes has better options.

Having the above said, RX-S is a quality-built rubber and there is no wrong in using it if one desires. Be extra cautious when changing rubbers since the soft sponge can easily be damaged in the process. Hence an averaged (8) for durability: (9.5) for good durability if stuck on the same blade and (6.5) for sponge fragillity upon rubber removal/glue removal.

Very picky rubber.

Avoid using this rubber if you are not a fan of mushy rubbers.

This rubber's sponge is very soft, almost to the level of mushy.
Because of that softness, it is good for blocking and control.
In my opinion, I would say this rubber is good for beginners or people who wanna switch to shakehand from penhold.

I used this rubber when I switched from penhold to shakehand racket.
At that time, I could not do any backhand basics of shakehand, so I chose this rubber.

At first, Although this rubber is quite bouncy, I could not perform aggressive backhand loop.
It was because of the softness of the sponge. The sponge prevents players from adding speed to the balls.
So, if you have confidence in your backhand skills, I would not recommend you to use this rubber. Go for Rakza X or Rakza 7.

However, I liked this rubber's softness since this rubber's blocking and control was so good.

I would not say that this rubber is for everyone.
Maybe this is for players who are not very confident in their backhand skills like me.