I'm sorry but don't understand exactly what this is. Is it a universal text app that you can use for all your contacts? Or do you need to know if the person you're texting with has an iPhone or not? Given the excitement and number of upvotes I'm obviously missing something, but I'm at a loss.
What Beeper does (especially since it's such a huge technological achievement by reverse engineering the iMessage protocol, as opposed to just using a Mac server as a "man-in-the-middle" iMessage communicator) is unlock a part of the iOS ecosystem to non iOS users in a way that Apple has been avoiding for years.