Completely customizable colors and fonts, including downloadable font packs for more options. Background pictures add a nice touch. Notifications can be customized for each contact, including icon, sound, and even vibration pattern. Convenient pop up with reply option so you don't have to open the app to read your message and reply. It includes the contact picture in both the conversation list and the pop up making it easier to reply quickly with just a glance. I have been using it for several months and never had a force close or any problems whatsoever. This is definitely one of my most used and most reliable apps.