Regarding legality, they webpage does state “This is to inform you that the Food and Drug Administration has determined that it is in your best health interest to obtain a medical evaluation by a licensed physician, who specializes in diseases of the ear; then to be tested by an audiologist, or hearing aid dispenser utilizing established procedures and instrumentation in the fitting of hearing instruments.”
They then go on to say “Note: Ordering a hearing instrument from this web site constitutes your acknowledgement and acceptance of this “Waiver to Medical Evaluation Requirements”.” Now typically one can obtain a waiver from any dispenser, but it is generally a form to fill out and actually sign, as opposed to purchase constituting a waiver. I would hope most individuals purchasing hearing aids would read all the information on the page, but this is down at the bottom so I could see it being overlooked.