It’s the advantage (like they said) that you don’t have to login into Salesforce. This tool slows them down, and via voice they don’t have to use the salesforce application directly.
Imagine you have awesome ideas and plans and have 8 hours a day. But if you can only be productive for ~6, you’re losing a ton of time just because the tool is bad designed/planed/slow/{insert more words here}.
If you want more about that, I would recommend reading the book. Quite interesting read :).
I just feel that "via voice" is what makes me having doubts. Almost any tool could be adapted to a "via voice" interface, but which tools will become better for it?
I have a hunch that almost any custom interface on top of Salesforce would improve it.
And if a voice interface is a great improvement, how much of that is because a voice interface is a good choice for this application, and how much is because Salesforce sucks.
If you want more about that, I would recommend reading the book. Quite interesting read :).