I remember the old fashioned ‘behind the ear’ hearing aids whistling all the time. Do modern hearing aids whistle ?
In a word ‘no’! All modern digital hearing aids have the ability to cancel out feedback and there should be no whistle at all when wearing the aids. The fit of the hearing aid must also be correct to ensure no whistling.
Comfort
I don’t really like things in my ear. Are hearing aids comfortable ? ‘In the Ear’ hearing aids are made from an impression of the ear and therefore fit comfortably and securely in the ear. ‘Receiver in Canal’ aids which comprise of a small hearing aid on the ear and a thin receiver in the canal are so light and comfortable that many people forget they are even there !
Price
Are they expensive? Like anything else in life you get what you pay for. Hearing aids should make a noticeable improvement to your quality of life and last several years.