Mild dB reduction, good sound quality.
Good noise reduction, without completely deadening the sound.  Worked well at an outdoor festival.  Might be a little too modest a noise reduction for some of the more obscenely loud indoor venues, but it definitely takes the edge off and the sound is a bit more true than foam earplugs.  I tend to have small ear canals, so I've found some silicone earplugs to simply be too large to be comfortable, but these were good for the better part of a day, and stayed put even during violent moshing.  I do like the reusable container, which is considerably more robust than most.
Rating: 5 stars