Star Wars: Force and Destiny
I have very limited experience with the Fantasy Flight Games Star Wars line, and zero experience with F&D specifically, but the core mechanics across all three games are the same. In my experience, the dice take about a session to get used to, and then things go along just fine.
However, if you're used to more crunchy systems like d20, you're going to have a rough time wrapping your head around the "narrative" focus of FFG's Star Wars. While the dice do dictate success or failure, they also dictate the circumstances of that success or failure, where you might succeed at your given task, but create a whole new mess of problems for yourself, or you might fail, but find a way to leverage new advantages.
For instance, on a slicing check, you might manage to gain access to a secure terminal, but set off an alarm in the process, or you might fail to gain access to the information you're looking for, but run across the controls to the facility's automated defenses.