The MD Air hearing aids work great; I have reduced the volume on the TV by 40%. I am still trying to get rid of the occasional squeal. I worked in construction all my life and have tinnitus real bad... when I wear my hearing aids the hissing sound fades into the background, this is an unexpected benefit. One thing that I have trouble with is the stabilizer "twigs", they do not mold to the ear very well and keep popping out. These hearing aids are close to invisible. A very good value for the money.