I'm like you, I'm, basicly a strummer and plan my major instrument to always be acoustic. I bought
PlaneTalk and have had it for a little over a week. I definitely think that it will help you master the things you're interested in. I'm working with it and think it will be worth it, albeit I'm a slow learner and think it will take me a while to wrap my mind around all the information. I think you should give it a try!