The regular stuff
My network was detected in a jiffy, as were the 3G settings (the 4G model hasn't been launched in India).
While S4's keyboard might not be as intuitive as the BlackBerry Z10's, its predictive text is good.
The screen space is good for browsing and opening multiple tabs in a single browser window didn't slow the phone, nor did it heat up. Multi-tasking and gaming were a breeze.