It's about 80% there. If they fix the remaining issues with cards having inaccurate stats, and some theme forces being completely incorrect, it will be fine. Haven't tried using it for damage tracking or any other games, but considering that it runs pretty reasonably on my rooted Nook Tablet (which it was NOT designed to use) it's not too bad on a tablet.
I can't see it finding much/any use on a phone. this app was made for tablets, and works best on that medium.