Yes, I have read it. I would say it's mainly useful as a reference book - if you are interested in the older stuff. Quite good if you have an old chassis or body from the '30's, or earlier, and need to identify it. Not much about racing and Geoff (the author) is the first to admit that he knows little about the more sporting aspects of sidecarring! Is it worth buying? That depends on your specific interests and what the current price is. It was out of print for quite a while and has been recently reprinted, possibly for the last time. On a scale of 1-10 I would rate it at around 5. Hope this is of some help!