[mft_]

This was my initial reaction - it feels a little bit like the option to send short voice messages via iMessage on iPhone, rather than typing. I've never used that feature because it doesn't seem to offer the same convenience factors that text messages offer - especially the ability to compose and consume them in any environment, irrespective of noise (or quiet), companions, and location. Kind of one step forwards, two steps back.

None of this is insurmountable, but I wonder if it will cause inertia in experimentation and uptake?

Good luck, either way - love the initiative the founder has shown. :)