Nice review. While I enjoy both stories, I can understand that you have to adjust your mindset to the period to really get into them.
I'm certainly glad these are being re-released at a lower price. This is definitely going to be my Mom's birthday present. (Don't tell her!)
A couple of points: first, you learn a bit more about Lord Peter's experience in the Great War in the later story "The Nine Tailors", arguably the best story in the series. Also, as a Whovian, I noticed that Anthony Ainley plays the victim in "Clouds of Witness". I half-expected him to regenerate after getting killed.