Work well, although uncomfortable, but be careful not to dent the front!
These do the job of providing a good seal. The two back-of-head straps hold them on securely, and if you fit them according to instructions provided, they don't leak. They also are good at keeping glasses from getting steamed up. The one problem is that the front of the mask projects outward, to leave room inside for your nose and lips. However, there is only very little room for clearance here, and if the front gets dented inward the least little bit, then the mask will end up in your mouth every time you take a breath. This can also occur just because of the humidity created inside the mask when you breathe. This might be less of a problem for a person with a small face, but 3M should offer a slightly larger size for the average person. You have to be very careful not to let the front of the mask touch your fingers or anything that might dent the front. They are very uncomfortable to wear, but I guess that's to be expected.
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