The top of the Moto X houses the centered headphone jack. We haven't seen this placement on too many recent smartphones.
Since we tend to have a lot of devices laying around, we might as well do some comparisons! The Moto X is certainly not small, but it is a bit smaller than the S4, and we are fans of the contoured back.
This is the first and only smartphone that's "Designed & Assembled in the USA," to our knowledge.