I purchased a set of the M-2 earplugs at the bike show in Minneapolis along with a couple sets of the premium earplugs.
I have used the M-2’s for 18 hour days on the bike with no issues and after over a year of use, they are showing no signs of wear. These are holding up much better than a previous competitor’s molded earphones. I also use them for flying and like the better sound quality and and reduced noise on long flights.
The only issue I had was when I stepped on them an crushed one of the plugs. I was very pleased with the service I got on the repair and they were as good as new.
I use the premium plugs at work, and at home on the tractor and for shooting.
A very satisfied customer and Mark is the one I will go back to for all of my future earplug needs.