I like it.
NUTSHELL: Each day you use the app you're given 25,000 credits to use towards the purchase of "packs" of digital trading cards. If you use the app seven days in a row you get a bonus of 40,000 or 50,000 credits. There are five or six parallels of just about every card. White is the standard, then [in order of scarcity] blue, red, and yellow. There are special subsets that are only available in specific packs for a day or two. There's a nice subset of the various movie posters as well as a subset of "The Force Awakens" cards that look like the original Star Wars trading cards.
You can buy extra credits which will unlock access to special packs. There's only been one time that I bought credits [I really wanted that R2-D2 "shadowbox" card that was only available for a couple of days]. Other than that I've made do with the free credits given to me daily. It does a decent job mimicking the process of opening a pack of cards and flipping through them to see what you got. And just like with old trading cards you'll sometimes get duplicates in the same pack. I've been using the app for two or three weeks and I still enjoy it. I'd just like to be able to trade some of my duplicates for cards I don't have.