Worked really well for me sending 1080i picture (Sky+HD) over a 30m length using Cat5e cable. I compared the tv picture from this to a direct feed from the back of the tv and you cannot tell the difference!
A far cheaper and easier option than buying a 30m HDMI cable especially when you are putting it down the side of the house.
The book does what the title says, it details all of the worlds flags (as of 2009 - so includes ommisions like South Sudan) with good size pictures. Along side each picture a breif description of the flag is given along with its meaning and origin. Its not just countries, oversea terretories and regions/ states of countries are also listed.
My only criticism is that notation like "this is an overseas British Terretory" is within the description and it would have been nice if that was clarified in the sub header beneath the offical title of the country.
That said is a really good introductory book to the worlds flags including non-recognised states such as somaliland.