My expectations of this book were never towards a light, easy read. The VSIs on Hume, Hobbes and Spinoza were all tough for the general reader, but, with perseverance, not insurmountable. This one, I'm afraid, defeated me. I forced myself through to the end, and what I understood, I enjoyed. Most interesting to me was Scruton's account of Kant's political vision and the introduction to Kant's metaphysics with relation to the rationalist/empiricist positions of Leibniz and Hume.
Beyond that, there were large chunks that, for me at least, made for tortuous reading - no doubt a reflection of my own intellectual limitations rather than any failing of the author, who, to be fair, pre-warns that a re-read will be necessary. I realise that Kant's ideas are notoriously tough even without their own ambiguities and contradictions, but other readers have obviously got a lot out of this book, so I shall probably file this under 'to re-read'. In the meantime, take this rating as a first impression - possibly of use to other beginners, and hopefully to be revised at a later date.