Had it for years... not terrible most of the time, working in a factory at a young age (19) probably did it. It's not particularly problematic. But its noticable when in a quiet environment (I can hear it in the background right now :D - most of the time i forget its there.
I probably have some other issues with my ears as I have had serious issues with vertigo which was fun, not had an attack for about 8 years, but yeah that was fun. I thought I might have meniere's disease but the Dr's never really confirmed it or were very good at diagnostics. My ears can be very sensitive to noise,.