Get it. Now.
If you are comparing this to something else and can't decide what to buy, you want to buy this one. The Session view is a game changer and the workflow is built to keep you creative and productive. No more getting stuck in loops or grooves with no song to show for it.
The instruments and effects that it comes with are more than enough to get started immediately.
Everytime I read the manual I find some other new cool way to push my creativity. Incredible application. Totally addicted.