They work well while challenging in the area of comfort.
These earplugs are much better than the foam disposable earplugs and they don't need to be thrown away at the end of the night.  What I think these earplugs need is some fine-tuning of size.  I tried the small for my left ear (the smaller of the two) and the small was too small.  My right ear canal is larger and the medium-sized earplug fits well.<br /><br />I can generally sleep 5-7 hours with the earplug in, but by the 5th hour, my ears hurt pretty badly.<br /><br />Nonetheless, they do an adequate job of quieting the environment in general, however, the snorer next to me seems to be insurmountable.  The earplugs mute the snoring slightly, but not quite enough.  I am a very light sleeper, so your results may vary.
Rating: 4 stars