There's isn't anything out there quite like these headphones. I was expecting the audio quality to be worse than it was (because audio quality wouldn't be the main reason people would be buying them), but I was pleasantly surprised. There is some decent soundstage in these cans, they have nice equalization with detailed performance and I would happily use them as normal headphones. They definitely have their own audio profile and it's very nice.
I'm waiting and waiting for the ECG feedback/reports on the app to become available. Note to the company if you are reading, please could you also include an audio recording functionality which is adjustable to be automatic at certain levels. It would be good to record our audio in our sleep to hear any talking etc.
I think one main criticism would be the battery life. It is shorter than most other headphones but given how these are intended to be used, most people would be charging them for a full nights sleep or for every plane journey anyway.
Overall they are very comfortable, they do "kokoon" you well! They look good. Having seen both, I think the black looks much better in person (and would show up less dirt/wear and tear then the cream over time). The app is very good so far and more is on the way. For a brand new headphone type from a Kickstarter project, I'm really impressed!
Bottom Line: Yes, I would recommend this to a friend