This looks interesting and it's shipping tomorrow. Though I don't think it's designed as well as Coin, I do think it's headed in a better direction. Products like this move us toward electronic payments, whereas Coin supports the existing card-required payment system.
"In fact, this network is probably one of the most valuable and consequential technologies currently on the planet... The transmission of value and ownership has thus just been severed from the State, not by impotent voting, but by the technological achievement of man."
Giving up 15% of your company for $150k? That's the amount you'd expect to give up, roughly, in your seed round. It's hardly worth considering if you think your company has any value.