It works which is more than I can say for a lot of add-ons but that voice is terrible. I can hardly understand it. It's like they dug up the old Dr. Sbaitso voice and sped it up. With that old of a voice generator it would at least be helpful if there were options to control its tone, pitch, and speed to fit the user and make it more understandable.
As it currently stands it's fairly unusable.
I applaud the effort, but unless you can get a voice made this century I can't see myself using it.
(I understand licensing may be an issue; can't say that I know how availability of different voices works for these types of projects.)