Fully digital hearing aids are the most expensive, and when you compare hearing aids you will find many reasons why this is so. The difference in sound quality is like the difference you get when you go to digital music recordings from old fashioned record albums. This is done through DSP, or digital signal processing. A Tempe digital hearing aid from us has all these things.
There are differences in the programming as well. One thing to notice when you compare hearing aids is how many channels or bands it has. This is important because if your hearing loss is not the same for all frequencies, you will want different frequencies adjusted differently. Some people may only need a couple of bands while others may need several.