Note from the Audiologist: Unitron is the only manufacture at this time that allows you to buy a hearing aid and then upgrade that hearing aid without buying a brand new hearing aid. I think this is really neat and I have some patients who this has worked out well for. For example, you can start off with the North 500 and then at a later time I can upgrade the software so that same hearing aid is now a North 800 or even the Pro. You get to try it for awhile and if you like it, we purchase the upgrade code from Unitron and it becomes permanent. Obviously the upgrade must be in the same chip family, and not a new product line. Their hearing aids are solid and their pricing is competitive giving my patients a great bang for the buck. Their customer service has been very prompt and helpful.