Yeh, know what you mean. Karen my teacher has me practicing the articulations until they are perfect. It's definitely helping with my reading and articulation and technique. Just done another 30 minutes on this. I am on to a new one which looks easy enough but seems impossible right now.Started working with them years ago when I first started playing. Couldn't get to grips with many of them, but of all my books I still come back to them now as I find them really good phrasing exercises.