I have never read any of Mr Oliver's previous work and unlike the Osprey books there is no mini-biography.
The book is 64 pages plus covers.
There are a number of photographs in the book that I do not have in other books (including a third photograph of Brigadier Harvey's tank, though not showing the Panzerschreck box on the right mudguard).
The colour section (12 pages) is informative and back references the photographs.
The model photograph pages (10) are less useful and the supplier pages (10) (with the exception of Company B decals) do not cover 1/56 scale.
!Edit: I noticed the S and S Firefly conversion today, sorry!
The three page Normandy timeline feels a bit like padding, a simple map would have sufficed.
The text is informative, and the who had what table is the first I have seen.
From the book my Sherman I tanks were not part of second Armoured Battalion Coldstream Guards and even if they were, they would not have had squadron markings, using a continuous numbering scheme. The latter appears to contradict British Tanks in Normandy (or at least how I had read it).
Overall the book is good, but I would suggest you have a look first before you buy.