I have it on my iPad and iPhone. Since I happen to own an iPad and iPhone, this has given me, essentially two sets of dice at once for the price of one.
To me it's definitely worth it. $4.99 may seem like a lot for digital dice, but here's my reasoning:
1. These are, of course, custom-made dice specific to Star Wars: Edge of the Empire. Right now you get 1 set of physical dice if you buy the Beginner Game, but, besides the Beginner Game …
2. If you didn't buy this app, you'd have to either buy blank dice and apply stickers to them, which is tedious and may cost more than $4.99, or you can apply stickers to the dice you already have, which is tedious and inconvenient for playing other games which use normal dice.
3. Owning the app and the Beginner game will mean you effectively have two sets of dice, which may help out any players who haven't made the plunge themselves and don't own dice for this game
4. The app itself is super cool.
By which I mean, it's beautiful, with great Star Wars sound effects, it's easy to use, includes a help menu, has easy-to-read dice, and is a lot more polished than other dice apps you'll see. Whenever there's collision problems with dice, it sorts itself out very quickly, and I never had any troubl reading them. You can easily remove all dice in play, or just some, add select dice and even customize which dice are available in the first place.
The various Star Wars backgrounds are pretty nifty too.
For me the only glaring thing it lacks is multiple tables. It would be nice to have more than one table of dice available at the same time, so you can have different rolls keeping track of different characters and situations at once.
Bottom line is, digital or not, it's an extra set of dice to pass around the table for 5 bucks, and that's really not bad in my book.