Review (5/5): Works with glasses with a bit of fiddling.
With a mask on I kept getting mask in my mouth a lot like I was trying to inhale it or something. This small device helped a lot to keep the mask out of my mouth and helped me feel like I had a bit more air. It is not uncomfortable at all, it just sits on the bridge of your nose and the mask holds it in place. I wear glasses and had to fiddle a bit but it is no more or less comfortable than a mask alone.