I have only had one pair of hearing aids but am currently replacing them. I've had them 7 years and my hearing and the advancements have changed a lot. My situation is rather unique in that I had cancer in my parotid gland. After surgery where they removed part of my ear canal I lost most of my hearing in that ear....age took the other ear. I had a mold in my right ear for several years but unfortunately due to the radiation, my skin inside my ear is like tissue paper so it irritated it until it bled. I had to give up on it and go with the domes. I have had really good luck with those but my problem now is I get a lot of feedback and I am hearing but not understanding what is said. Let me know how your search is going.