Bob
I'm definitely not an expert on trams, so not sure how much my opinion is worth, The book is produced to a very high standard in terms of reproduction, though this means it is expensive (the most expensive of all the 40 odd tram books the author has produced (this from Waterstones webpage)). I have not fully read it but my comments are as follows. The book is very readable, probably even to those with no interest in trams. It does contain a lot of information, some of it reproduction of articles from other publications. There are two very nice coloured maps of the system, very well reproduced. Unfortunately they are double page, and to fully view the areas down the centre it would probably risk breaking the spine of the book!
On the whole I do not think the book adds anything that was not already available, but brings it all together in a very readable manner, which, as far as I (a non-expert) am aware , has not been done before. If you can afford £40 (and no reduction at Amazon where you also have postage) and want a pleasant read on the subject then this will provide it. But the cost is expensive for the average reader. Value for money - books this size produced (in terms of paper, printing etc) to this standard will cost this much - and it depends if you think it is worth it
hope that opinion ios some use