All I can really say is that alot of deaf people have it because it is an excellent communication device for them. My mother has taken up sign language to help the deaf that are in need. And every single one of them have a sidekick. I believe she said they got them free or a handsome discount because they are deaf. Now she wants one.
Mostly all of their communication is done this or a TTY machine. I would assume that it is an excellent investment for those like you and myself that just like new technology.
Now I may need to look into 1.
Gizmo's mom