It has a collection of smaller readings so you don't get bored and/or get confused getting through a 500 page tome on your first go. The subjects covered are fairly interesting (epistemology, philosophy of mind, etc.), gathering material from a mix of time periods.
A problem with a book like that is that it doesn't have commentary built-in, so if you misread something and run with it, you might not realize it in the future, if ever. I used the above book in a class, which allowed me to bounce ideas off of other students and, of course, the professor. Consider getting a book more along the lines of a textbook when you're starting out so that you have readings along with commentary by a person knowledgeable in the subject.
Oh, and the Stanford Encyclopedia of Philosophy is useful: http://plato.stanford.edu/
http://www.amazon.com/Archetypes-Wisdom-Introduction-Douglas...
http://www.amazon.com/Giants-Philosophy-Series-Audio-Classic...
Also, working chronologically is probably a good idea. You'll get to see how ideas have developed (and stayed the same) over the ages.
Source: philosophy major.
"his [Giordano Bruno's] condemnation for heresy was perfectly understandable, whatever one may think of the physical treatment meted out to him. His ultimate fate has, of course, led some writers to attribute to him a greater philosophic importance than he possesses."
Furthermore, Copleston ignores non-western philosophical thought entirely.
And of course it ignores non-western philosophical thought: it's right in the title. You wouldn't get up in arms over a jQuery book completely ignoring C++ calling conventions.
What matters is finding something accessible and interesting.
So long as it isn't Ayn Rand.