Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Excellent training

I have tried many methods of training. Most fall short on many accounts, some less so. Although this book is terse and strangely organized (you have to flip back and forth constantly to follow the lesson plan) it is well worth doing.In less than a week I can already feel the difference in my playing. It might be the fact that I am simply following the instructions and not wasting any time during the small amount of time I get to practice, or the combination of chord, scale & arpeggio exercises. Whatever it is, it works.It has also helped with sight reading. I have gained some confidence in that area by trying to read while playing (although the current tempo tends to make that quite difficult). There are some errors in the music notation, but they are easy to spot and ignore.My suggestion, above and beyond what the authors suggest, is to play all of the exercises with a metronome. Even the chord groupings. It increases the benefits of the exercises with very little extra effort.