I know that this is/can be a controversial issue around these parts, but I wanted to share my experience with earplugs . . .
I have been staunchly anti-earplug for a long time. Both of my vespas have tall windscreens and I wear a modular helmet, so I felt that I didn't need them. I also felt that they would be dangerous because I wouldn't hear what was going on around me, yada yada, etc. etc.--excuses basically.
Anyhow, fast forward to last week when I was forced to stop at a hardware store and pick up a pair after an extremely painful 15 minute ride on a non-windshielded PTW.
After gaining immediate relief, I decided to try them once I got back behind my shower door--and I can tell you that the difference is astounding. I'm sold! I find myself less "on edge", and contrary to what I had thought, they do not eliminate the sounds around you--but rather reduce the volume to a point where you can hear the sounds you need to hear more clearly. I find myself more focused, because I'm not distracted with all of the busy noise.
I started off with the foamies, and then switched to the triple flange silicon jobbies that are connected by a cord--I found these to create a much better and more reliable seal. I have a pair of etymotic research er4 earbuds, so i'm very adapted to the triple flange design. I also ordered a couple of pairs of the ety-plugs to see how well they work.
I guess my point here is, if you are like me and are anti-earplug, spend a couple bucks on a set of plugs and take them for a test ride--you just might like it, and might save your hearing in the process.