No, can't say I do. I have a brush for tile, but not one for carpet.
I've heard from several guys that the brush works great, I might get one eventually, but I have so many red pads, I figure I'll just use them. I've never had a problem with the red pad on residential. In fact, most of my work IS residential, and no complaints to date. But the red pads do work great on cgd.
Also, I've heard the brushes tend to distort the carpet fibers.....any truth to that? I used to own a Rotovac with the brushes, and can't say I ever noticed any distortion, but they were rather soft bristles, and the Rotovac weighed less than half of what my 175 does.