I've read it (in fact I have a copy): I'm also aware of the "reputation" it (the specific book) has among some circles. How reliable it is is too uncertain for me too use quickly. In fact (and I suspect you agree) I tend to be leery of Osprey books--even more so of the pictures within: the few I use I only do so because the author's reputation is solid and well known, so reliability can be assessed quickly for a given topic.
Peter Connolly's book I use, and it quickly helped with the Hellenistic and Roman cavalry (and for stats, the works of Graham Sumner are a god-send). The other books you give I need a really cheap versions of, as they're comfortably outside my book budget (100 dollars per month).
bear in mind, the real challenge right now are formations for the cavalry outside the Hellenistic and Roman spheres, as well as basic tactics.
Bookmarks