I used to be one of the sceptics, but now I' m sold on them.
Trimming helps, IMO, but don' t get carried away with it.
IMO, the new QS biscuits have softer bristles on them than the original ones did. I used to think they made too much noise on the draw, but when I shot my doe, I came to half-draw 3 times, having the deer look in my general direction instead of at the squirrel that was drawing her attention, or the clover she was eating. I don' t think it was because she heard anything (I didn' t) because when she happened to quarter away, and I came to full draw, there was no reaction from her to the draw or the shot.