I'm glad to see a paid for service, by I don't think I'd take the jump for $10 a month!

>(from the website) we send each user a Jailbroken iPhone with the Beeper app installed which bridges to iMessage

Aren't you worried about Apple's reprisal ?

Also it might be worth adding a word about the privacy of the messages. Am I correct that the end to end encryption goes out the window and each Matrix connector can see the messages in plain text? I think it's not so much an issue as long as it's clear to the user, and that they pay for you to keep their private messages private.