I've played it and enjoyed it.
The dice are used, in theory, as a narrative tool. For example, you could fail but gain advantage for another try, or to give to another character to use (e.g. you fail to shoot a stormtrooper but cause him to dodge into an ally's attack); alternatively, you could succeed, but gain disadvantage anyways, such as when you hack a computer but leave enough traces that a security alarm eventually goes off.
The beginner's box contains a set of characters, dice and a quick start with an adventure. I think it's worth it for the dice and the adventure, though I trust you to make your own decision.