These games are great for using and practicing maths skills in a context in which there is some real motivation to do so. I love how they provide opportunities to explore a wide variety of approaches, including number bonds and logical thinking. There is also some thoughtful advice and ideas on mathematics education which I am glad to be reminded of, even though I have read Ms Gaskin's thoughts on these topics many times before on her wonderful blog!
The games use very simple materials, mostly cards and dice, and the few boards that are needed are provided. Each game also has tips on how to customise or extend it - maybe for players of different abilities, or non-competitive options. My children are always pleased, even excited, when I suggest one of these games, even ones that seem terribly simple like Tens Concentration. Sometimes they even ask to play them unprompted!
I have both books on Kindle, and really I would prefer a hard copy as it would be easier to keep handy, mark, and refer to during play. So get the paperbacks if you can!