I used the Decca carbon fibre brush of that type years ago. It did catch dust before it could get to the stylus. I could never verify the claims made for it that it took static electricity away from the record through the ground wire provided tough. I'm certain purists and others affected by audio nervosa could very well be of the opinion that it affects speed stability, but I seriously doubt that a lightweight brush used with any decent turntable would cause such a problem.
I would stay away from cheaply made brushes of this type or anything that has a plush roller or looks to be too massive.
I would stay away from cheaply made brushes of this type or anything that has a plush roller or looks to be too massive.