Great but watch out big ears!
These really get 5 stars from an 'intended purpose' standpoint but the lower rating is to serve as a warning to those with larger/deeper ear canals that the stems are really short.  So short in fact that, based on previous attempts with other earplugs, I didn't even bother trying to insert them but instead swapped them out for the long stem version.  Assuming the attenuation is the same in both cases, they're fantastic and do just what they claim to.  That said, even the long stem version were too short and I ended up needing help removing them later.  Admittedly I'm sure I've got freakish ear canals but if you have noticed difficulty with ear plug removal in the past, don't bother with these.  If you have normal human ears, they're fantastic, the packaging is great, and they do the job well.
Rating: 3 stars