Overall, I like the idea. I won't dwell on the price thing for too long, other than to say I agree that it is too expensive and that I'd much rather pay a month

Overall, I like the idea. I won't dwell on the price thing for too long, other than to say I agree that it is too expensive and that I'd much rather pay a monthly fee for an appropriate level of service than pay per message. Something I don't see mentioned a lot (here, and at messagepub.com) is the escalation feature. It is really cool to be able to call your api once and know that one way or another my user will get the message. Also, I was pretty annoyed that signing up resulted in 2 emails in my inbox.