For a long time I only had one core set's worth of dice, so I downloaded the app and used it extensively. It was a lot of fun, and worked smoothly; no hang-ups or slow-downs. Plus, the sound effects got everybody in the shop feeling the Star Wars vibe. It was great fun!
Another plus, is that you never have cocked dice. I had this one opponent who kept rolling his dice onto asteroids and ship bases (even on different nights!). He would try to balance another die on top of it to see if it was cocked. Is it just me, or is it pretty obvious that D8's are hard to stack on top of each other even if they aren't cocked? He'd roll all blanks, and then have to check a couple of them, and inevitably reroll evades. Frustrating and time consuming. The dice app doesn't have that problem.
Nevertheless, I have a second core set now and, have made the switch to real dice…mostly becaues real dice won't run out of batteries half-way through a tournament.