Is the textbook "James Stewart's Essential Calculus: Early Transcendentals" adequate and sufficient in its material and depth of each subject? I bought this book on impulse and I'm now worrying that it may leave out important subjects or not cover the material thoroughly enough. Has anybody read through this text? If I were to read through this text from start to finish and do nearly every problem, will I be missing any valuable information by not purchasing the original Stewart fifth edition early transcendentals textbook? In other words, am I going to be lost on certain topics when I take vector/multivariable calculus? In the preface, the author mentions this being 2/3rds of the original text while "covering almost all of the same topics." This word almost worries me and he does not specify what he left out. What should I do? Buy a different three semester calculus text? If so, which text would be best (calc I, II, and III)?