I downloaded this app for free through a Starbuck promotion and I'm totally impressed.
I love almost everything about it and I think it could prove to be so useful. Sometimes I just play a D major chord, or a major 7 chord, when I haven't yet looked at all the possibilities for "weird" chords. Obviously it's good to figure out chords on your own, but I do like the idea of using this app as a "calculator" some of the time. We all have moments where we're stumped or uninspired...so this is cool.