I have had it for a few years. I have also logged between half a mil & 3/4 million miles on bikes. At the same time I have been around lot's of firearms going boom, saws, nail guns, sanders & other woodworking tools. I remember back in the 70's wearing ear plugs while shooting, even wore/wear them while duck/goose hunting. I let my guard down on those power tools until about 20 years ago, so damage done. Anyway, for 80% of my riding...no ear protection, so I am leaning towards that being a major contributor. So, my question is to those that ride and have ridden a lot...are you experiencing any Tinnitus? Mine is like a herd of Cicadas & you can go to this link to find what sound your head is producing: http://www.ata.org/sounds-of-tinnitus Oddly enough, a few months ago I had the dreaded routine garden hose with a camera on the end "procedure". Ever since then, my Tinnitus has kicked up the volume by quite a bit. I think something in the anesthesia may have irritated it.