The Acuda series has been developed for the fast offensive play with more emphasis on spin. Acuda S3 has a very soft sponge designed for powerful spin and the positive blocking game.
The Acuda S3 is a nice soft rubber when paired with a Stiff blade. It has great control on loops, flicks, pushes and chops. Though because of it's softness. It lacks the firmness and kick needing for passive blocking and caused my blocks to net, which required me to add effort to make sure that the ball would clear the net.
I am currently using the Acuda S3 as a T64 replacement (too expensive), and its works fine. It can perform passive blocks with ease, and have very consistent looping capability. One of the drawbacks is due to its softness and grippy rubber it makes difficult to perform short pushes or touch play near the table.