Product review (5 stars): In a good way. It will track curves very well
Got this product to clean out my dryer ducts. They are about 20 feet. They leave the driver go between the first and second floor and out to the side of my house.

The flexible pieces are VERY flexible. In a good way.  It will track curves very well. Follow the directions and tape each piece. They will come unscrewed easily.

The brush head does great and pulling out lent. I ran the brush up a few times and pulled back lent every time.

Only complaint, it says u can use with a drill, but all the pieces are the same, it would help if there were one end piece that was made to fit in a drill.  My drill closed down on it but I bent the piece a little from tightening it down.