I like most gardener brushes and still use my first black flocked and white dual trim. They have served me well. But with the best intentions I fell the sill brush as some more development work to be done. I feel the end of the brush needs more support from bristle at the right and left end of each brush.They feel as if they wobble to much, Ii have all three white, black and red.Thay are not as stable on the glass as the super lite range. By the time the sill brush splays to the sides and work well they are reaching the end of there life. When they are new they feel to me like a Robin reliant with one front wheel.I am not trying to diss this brush only my feelings for what it`s worth.