This book may be a good companion to an introductory philosophy class, but it's not a great stand-alone book. The contents are just essays about famous philosophers' famous essays; those original essays are not included, but merely referenced and sometimes briefly quoted. It's like a (very large) Cliffs Notes of Philosophy.
This could be a good companion to original texts; it could be good if you don't want/need to read the original texts; it just wasn't for me.
Initially I felt like I was missing something when reading; (as you can see by the struck-out text above) I wanted this to include the original texts. After reading a few more essays, though, I started to be okay with it. I think maybe because most of the first few essays were about texts that I remember well from reading in college, it seemed like something was missing, like the essay authors weren't getting the full essence of the original works. However, once I got beyond the works I knew well, I felt less cheated by the essays.
So then, I'll still say that this is like a (very large) Cliffs Notes of Philosophy, but not in a negative way. I now think it works both as a companion to the original texts, with possibly a philosophy teacher guiding the reader, but also as a stand-alone text to give the reader generally good overviews of philosophical works (although, sometimes the essays went over my head, too).