This rubber has a sponge that is right in the middle between the soft Calibra Sound and the hard Calibra LT. As it's name suggests it's the spinniest of the three rubbers, which you can feel both on slow loops and on power loops. It's not as spinny as Tenergy 05 but it's not far behind.
The speed is quite nice too. Loops are great but flat shots are not so easy to perform. I use it on the forehand as I found it too difficult to control on blocks and punches for the backhand.
Keep in mind that you have to dig into the sponge to produce the spin from this rubbers, unlike Tenergy style rubbers that produce a lot of spin even when lightely grazing the ball.
Very good rubber, very spinny, very good speed and amazingly very good control. But it is not that durable. Overall very good rubber for offensive play.
The soft sponge of the rubber makes it difficult to play if not a trained player. The blade also should be well considered, i use a carbon blade and the combination does work very well.