It has grown and matured, to the point where it can be used as an entire SMS conversation holder. It can send SMS's, and it can receive them. It's not *yet* meant to be able to replace your normal SMS app (and it never really was, but it's growing), but it certainly works for the purpose described above... to intercept texts that you don't want showing up in your SMS inbox.
While building it, I suspected that people want to use this for private communications. Just to be able to keep their texts to certain people kind of hidden. As such, the app requires a login by default. You can bypass this, by long holding the skull (after putting in your user credentials) and the app will auto-login.
There is a lot more on the way. The ability to keep an entire SMS thread off the record (no history), auto-responding, sms blocking, and sending a text to someone at a specific date and time. It will grow, but in the mean time, it's nice for redirecting SMS's to somewhere other than your normal inbox, and even being able to chat a bit.
There are a couple of things I'm stilling ironing out: ie: automatically updating the view when an SMS comes in, and the ability to remove an SMS thread, and possibly even individual messages, but remember.... it's not done yet.