Good brush - I use a single trim monofiliment on my SLX 25. Or should I say 2... The first one wore our pretty fast (in 5 months) because of the contact with window reveals slowly but surely exposing bristles at the edge of the brush. These bristles then start shedding. My second brush is about to go the same way and I have a third ready to go. The brush is so light compared to, say, a Vikan. Saying that I have a Vikan sill brush on my 4 foot pole that I use for bungalows and I wouldn't be without it.