i have been playing for years but i still started with the core learning system,i never took lessons so even if i can play fairly well there was a great deal i didn't know or thought i knew but was wrong :( went threw part 1&2 of the blues section and still going back to part 2 to cover things i had problems with i won't say it improved my playing a great deal but it greatly improved my understanding which in the long run will make me a better guitarist so i'd say it's well worth doing.