This was an impulse buy and I love it! I was waiting for something like this to come around. I knew it was only a matter of time before someone made one. It's so much fun and the sound is awesome. It's made very well. The app works perfectly. I feel like I'm cheating and wish I can learn the good-old-fashioned way, but I tried that and lost interest quick. It has an extensive song library filled with popular songs everyone knows and the best part is, you can play along with them and record yourself. You can even record your voice! It shows you the chords to strum while you're playing along, like words being highlighted in a karaoke song (it shows you the words too).
So much fun. I love it. You can literally hear your progress if you save your songs. Soon there will be a smart guitar, cello, violin, trumpet, sax...etc. This is our future in learning instruments.