Mossberg tested the Galaxy S 4 intensively for four days and while he admires some of its features, overall, he declares it isn't a game-changer. Rather, he states, "It's an evolution of the prior model and despite some improvements, it still is especially weak in the software Samsung adds to basic Android. I found Samsung's software often gimmicky, duplicative of standard Android apps, or, in some cases, only intermittently functional."