The new bristles glide better, but for me I did like a bit of drag.
I can't make my mind up about them, they did impress me the other day when using warm/hot water on bug spots. I seem to scrub more on snail trails though.
I have just finished epoxying a row of constructor brush hard nylon bristles through the centre of one of my new tapertec brushes. Looking forward to giving that a bash.