Gombrich illustrates all works he references, which actually is both rare in this type of book, and essential. If you're interested in the subject but hate the pomposity usually associated with Art then its great.
For Students: As textbooks go this is a pretty good start to any studies based around Art. It's been a recommended text since the 1960's and quite honestly is just as relevant in its 16th edition today. It is worth knowing Gombrich is noted for his study into Renaissance Art and History, and is criticised for his approach to modern art. That is, to be honest a minor comment to an otherwise great starting point for studies.
Reading for interest: If you're interested in Art or even History in general then this is perfect too. The vast story of the visual arts holds such insight to cultures, traditions, ect. No prior knowledge needed, maybe you're looking for a book to dip in and out of, this is perfect for that too, easy sections with no real heavy reading required.
I would highly recommend this book, intelligently thought through, although slim on modern Art.