hello drummers i am really eager to learn some off that complex rythmic stuff, i have seen that Gavin Harrison have three dvds out called Rhythmic Visions & Horizons, and Rhythmic Designs but he also got a book called Rhythmic illusions. now i dont know what to do. do need to buy all of them in order to get a complete understanding of all this complex funny stuff? isnt it enough if i get Rhythmic Visions & Horizons?. for the ones that own his dvds and (or) books please answer i will be grateful