If you recall, the One X was once the top dog in HTC's One series handset line and is not even a year old. While the phone may not be as powerful as the upcomingwhich boasts quad-core processing and more RAM, the older One X is still a solid device.
First off, the One X runs Android 4.0 Ice Cream Sandwich. Sure it's not 4.2 Jelly Bean, but it's still modern software nonetheless. Second, the Once X's 1GB of RAM and 1.5GHz dual-core Snapdragon processor provide plenty of performance speed for typical mobile tasks.
Third, the built-in 8-megapixel camera and HTC's imaging system results in excellent pictures and video for a camera phone. In fact, it's the same circuitry used by its sequel, the One X+. Interested? Take a look at AT&T's site for more details.