Yes Nicolaas, that’s what I found with the rubber it’s pretty slow and not easy to generate power at all. It’s got amazing grip, spin and control so for some players it will be really well suited. But not for most modern attackers I would say. If you play a very controlled all round game or very much spin based it can be a great rubber then.
Gabriel in answer to your part, of course if you use booster on this type of rubber it’s possible to generate power and speed, but I think most players here want to have a rubber you can just stick on and use without having to boost. Different players like different things of course and this slower grippy type rubber will be absolutely amazing for some people. As with any equipment it mostly comes down to personal preference and style to what you will chose to play with.
