I'm very OCD about my work.
I went back to extreme brushes for about 4 months. At first I loved them, it feels like there is no weight on the end of the pole, and herein lies the problem. On some of my work I was checking on the 4th month I could see parts of the glass getting a slight hazey look in low winter sun light. The extreme brushes weren't cleaning as thoroughly as say the supreme brush.
Extreme brushes can work well, but in my opinion you have to scrub the glass an extra few times to take all the dirt off, compared to say just one or two passes with a denser packed bristle brush.
To me I'd rather have a bit more weight on the pole, but only have to scrub the glass once or twice to achieve a near perfect clean, than have a very light brush, but have to scrub three or four times.
No matter how good you want extreme brushes to be, they just don't cut it on all glass.