I was completely new to the subject a year ago and reading it has been an pleasant trip through basic econometrics. The text is full of examples and it only presents indispensable formulae so it is extremely readable in comparison with its competitors. Besides, it is written in plain English and it is clear that the author wanted to teach, to explain, to make it as clear as possible for you, the reader.
Despite the size (less than 750 pages of theories) it is amazing how many topics it covers. Actually, half of the book is the basic stuff of Econometrics but the second half is more "advanced" topics. Besides that, the author provides data sets and solutions for the exercises so it is easier to practice and learn by your own.
People may complain that it is not very advance, they are right, but the title says "Introductory". Second, the book is not oriented to any software package so I doesn't include any command and the transition from theory to practice can be a bit difficult to be done on your own. However,I think this is also out of the scope of the book and for this transition further support (teaching-books) is needed in any case.