It's a good mask if it fits. While my face is within the measurements required for this mask it leaked around my nose. It works well if you are 4' 10" and have a face to match. Here is my assessment of the issues with this product as a consumer. 1. Too small for the average human face. This should be offered in different sizes. 2. The internal frame that holds the filter in also pushes the mask away from the face. The frame should be made of a more flexible material, have hinges, or be made of separate parts to all fit on larger or flatter faces. 3. The straps connect to the mask too, close together and too low on the mask. This creates a pivot point towards the bottom of the mask which causes the mask to tilt away from the wearer's nose. I think that if the straps connected further apart or were anchored towards the front of the mask, like on a 3M respirator it would be less likely to leak. Overall, I think the concept is good and the build quality is good. I hope the changes are made and I would be will to give it another chance if they did so.