Initially, Samsung's 15-inch Series 9 looks almost perfect. It's thinner, but with a bigger screen, than most Ultrabooks; it's attractive and simple in design; and performs very well for its category. Unfortunately, it has some drawbacks--namely its shoddy keyboard and touchpad, but also its less-than-impressive speakers. Substandard keyboards and touchpads are more of an issue in ultraportables, since users are unlikely to want to carry around an external keyboard and mouse. The Series 9 also lacks some of the higher-end features we're used to seeing in 15-inch notebooks, such as an optical drive.
The new Series 9 is a tantalizing machine, and it fills the niche of the 15-inch Ultrabook. But I know Samsung can do a better job on the keyboard and touchpad. While they get on that, you may want to opt for a cheaper Ultrabook with more accurate input devices, unless you're absolutely set on a 15-inch screen.