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I have the Adjust a
Glide brush. The center riser is adjustable, taking pressure off the bristles. As the brush wears down there will be less pressure on the bristles and more on the center, thus it would require raising the center to allow adequate pressure back on the brush. Is that clear a mud?

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Thanks for the explanation Shane, I understand how the adjustable center riser works but I apologize for not asking my questions clearly.
First, is the brush Mikey showed adjustable or not? It doesn't look like it is.
Secondly, which carpet brush is better, adjustable or non-adjustable?
Thirdly, Does it really matter if its adjustable or not? And if so, why?
Thanks to Shane and everyone else.
Bill Morgan