I have it, and I don't hear a ringing in my ears. I hear a high pitched tone. When it's quiet it drives me crazy. Any little noise bothers me. The tv on too loud, the neighbor's dogs, cars going by with their stereos on... I have an Ipod and Bose earphones on now turned on as low as it can go. If I turn it off, I hear a high tone. I pretty much always have a radio or tv on softly at home and my Ipod goes everywhere I go. Loud noise makes it worse, so I wear ear muffs over my earphones landscaping. I even fall asleep with earphones on sometimes. Always on it's lowest setting though.
