In a word, this review can be covered with one word; meh. Its the same form factor as the iPhone 5, except a bit faster, an integrated touch sensor and world-wide LTE band support.
To be honest, the band support is the only reason to change, and even then only if you plan to change continents (which I did). Or because someone gives you a stupid amount of money to trade in your old device (which they did). Otherwise, save your money.