I have been playing guitar for 17 years and I wanted to get more technical. This led me to get the app. I got this when it first came out, and I was having fun with it until they started throwing weird exercises at me. My area of expertise is the rock and metal styles of music. There were some things in here that were crazy. The problem I had with it, is that they wont let you move on from anything if you dont meet their standards. The next part that got a little under my skin was the stupid ads to upgrade to premium on a free app. Now I only get like a half hour of time to move along in my progression. They say that you can play anything that youve unlocked afterwards, but they still barrage you with their ad to upgrade. Overall, I think that this is quite overrated and may help someone starting off a little bit, but the learning curve for these exercises gets progressively steeper as you go on and becomes a nightmare for even a professional. Its ok for what it is, but it certainly has its faults