SMS Inbox: A Messaging UI for Your Twilio App

I've been working on a drop-in messaging UI for Twilio accounts, and I think it's finally ready to be taken for a spin. There are definitely still some warts, and the sign-up/settings screens are not the prettiest things in the world, but I'm itching to get some real-world feedback!

Landing page is here: http://smsinbox.net

OR you can go straight to the signup page for a free trial: https://v1.smsinbox.net/account/signup

Comments and questions welcome!