Cataclysm 4.3 is a powerful stock rom. This rom has a wide support. It is bug free and works well. The rom comes loaded with certain unique features that you cannot find in the existing stock OS. Like there is an internal utility through which the phone automatically manages your 2G and 3G connection. You can set the priority as per your need. This utility is called as Smart3G. Once your phone is disconnected to a Wi-Fi, or your existing mobile data network the app automatically switches your internet connection to 3G.
This not only saves your internet bandwidth but also allows you seamless surfing. Other thing that comes in it is an integrated call blocker. You can restrict certain calls as per your need. Call blocker is a good app. You can avoid calls which you do not like. It has a white list also through which you can limit the number of calls reaching your device. Additional things that come in the OS is Fake Call app, Quick Toggle, Soft keys Fad Mod, Custom Lock screen Wallpaper, Full Screen caller, Speaker volume boost, etc.