Our Roomba has always wanted to find the perfect piece of furniture to grab the IR sensor. He never let me down, every time he did the first few minutes of work with him. We've tried blocking it with things, but didn't want to keep putting things on the floor just to keep the vacuum going. I took this hoping it would solve our problems and it works 100% as I hoped it would. Place a barrier pointing at a piece of furniture and Roomba will turn around before it gets stuck. All work is now going smoothly.