XPerience it's an CAF (Code Aurora Forum) based rom which aims to bring the perfect combination of both performance and battery life by bringing you our ultimate kernel and system optimizations in order to give you the best XPerience for your Android devices. Because you deserve to use your device's full capabilities without Sacrificing battery life.
Substratum is a client for managing overlays, allowing the providers to dynamically control priorities and enable/disable overlays..
When a new build is released, you will know with XPerience™ Center, it will display a notification message with the new update available.
The XPerience ROM have a lot of features configurables, and inside have Alessa™ kernel tweaker to configure kernel options.