These HD 390 aids have performed well and I am happy with them. I have had behind the ear aids in the past and ones which nestle just at the opening of the ear canal too. (HD500) Remembering that all hearing aids have some compromise, I think I like these the best and realise that I like the fact that they are hard to see, both by myself in the mirror and by other people. For me, I have learned that this invisibility is very important; without this I feel old - bit vain I suppose! The slight downside with the HD390 is a mild tendency to move out of the ear though I have not had one fall right out. Just check occasionally that they are secure as you do with spectacles. Push them in too far and they can hurt your ear a bit and interfere with the joint of your jaw. Just a matter of getting used to them, not a big problem at all. It would be nice to be able to have these adjusted by an audiologist, face to face using "real ear measurements", even just once when new, to be sure I am getting the most out of the aids. Maybe a plan for the future, Hearing Direct? Satisfied customer.