PhD student in British history here. I like them. Kynaston is really good at assembling truly staggering amounts of tiny, specific details, and building them up to create a deep textured portrait of the period; I particularly like to rifle through them for lectures, presentations, places in my own writing where I need details like that to make my point.

that said, the amount of detail is such that it can be easy to get lost in them. general overviews they are not. he's also not here for super hard-hitting critical analysis, so I'd go elsewhere if that's what you want