This book manages to serve no purpose whatsoever. It's far too long and unwieldy for the novice; bloated in the wrong spots for the intermediate; lacking in rigour for the advanced.
Maybe it's just that Russell is such a clear stylist.
The whole period from the Stoics could be replaced by a single chapter. His disregard of Hegel is horrible.
For the beginner, choose anything by Bryan Magee.