There's so much to like about the HTC One, and with a consistent (read: same) design across AT&T, Sprint, and T-Mobile, HTC is finally able to push their marketing efforts behind one device as opposed to fragmented carrier-modified alternatives. It's a powerhouse of a device, with a 1.7 GHz Snapdragon 600 CPU, 4.7-inch 1080p HD display with an impressive 446ppi, 4-ultrapixel camera with 1080p HD recording, 2,300 mAh battery, and Android 4.1 Jelly Bean with HTC Sense 5. The metal and glass exterior is absolutely beautiful, bringing an iPhone-like device to Android.
I wish the battery were a bit larger, but overall, this is an incredible device. HTC has made significant strides in improving the functionality of Sense 5, and it shows. The camera and HTC Zoe feature are both fantastic, and I use BlinkFeed more than I thought I would. The only thing keeping me from carrying it as my daily driver is the lack of 4G LTE (I've been working with the international version). Once I have some time with the AT&T variant, I'll report back.
Besides my particular need for 4G LTE, the HTC One is a fantastic Android smartphone that should be at the top of anyone's list.