If you read a lot of computer books, you can easily tell the good ones: they are frequently cited. Well, this book is frequently cited. You even find references to it in computer books that have nothing to do with C programming. That fact should tell you something.
I learned C from this book, and I have to agree with the authors that cite it--it's a good book. I have yet to see its equal for brevity, elegance, and completeness in teaching C programming. If you are a programmer who wants to learn C, then ignore the rest and read the best.
One warning though--this is not a book for beginners. As Kernighan and Ritchie say in the preface: "The book is not an introductory programming manual; it assumes some familiarity with basic programming concepts like variables, assignment statements, loops, and functions. Nonetheless, a novice programmer should be able to read along and pick up the language, although access to a more knowledgeable colleague will help." If you are a complete novice, heed their warning. If you don't have access to a more knowledgeable colleague, you will probably be better off selecting an easier book.