If you are a obsessive about a clean interior and having zero dust in your vents this is the tool for you. Deep cleans where other brushes can't reach and is bendable to conform to different shapes. Can be used dry or with a little interior cleaner on it. Pros: very useful for hard to reach areas of interior. Cons: none

The brush is sturdy, dense, soft, and long enough to do a thorough brushing of AC vents. The only drawback I found is that while the main stem of the brush is 0.25" there is a knot at the tip that is an irregular 0.30" and it doesn't fit into some of the smaller ports of my system.