QUOTE(C-Note @ Feb 20 2014, 01:50 AM)
It's like Cydia on iOS (am i using the right analogy here

?)
So far it is serving me well. Even has Pie controls and alot of other features from multiple ROMs.
More or less.
Cydia can be considered as full fledge 3rd party app store which allows all sort of apps for iOS.
Xposed Tool is more like a system modification tools.You may download the "plugins" and modify the OS.
But be warned, Xposed will modify the systemui which will prevent you from applying OTA update (if you prefer OTA).
QUOTE(Xirality @ Feb 20 2014, 01:52 AM)
Xposed can run on any phone? or there are specific xposed?
Xposed initially designed for the mediatek SOC devices solely because those devices lacks custom ROMs. But recent changes allows Xposed to be used in different ROMs. In case of Samsung ROMs, there's different Xposed tool.
If you want to start messing with Xposed, download & sideload the apk, reboot after installation and choose compatible modules. In case of Nexus devices, you may apply pretty much all the AOSP targeted modules.