Review (1/5): Not recommended at all
We bought these thinking they would be relatively easy to use and effective with the disposable pleated masks. They were not. The "hooks" that are built into the frame barely grips the pleats in the mask and if you move your mouth at all they come loose. You wind up spending all of your time readjusting the plastic frame.
We decided to give it another chance and my wife sewed loops into one of our fabric masks so that theses hooks would have something specific to latch into. This did not work either because as soon as you move your mouth, they came loose from the threaded loops that my wife sewed.
The frame was so small that it went from the bridge of my nose to my lower lip. Again, any time you speak or move your mouth it becomes dislodged.