Read this on holiday in less than a week and we were busy every day. I read it any chance I got as since the 2006 Ryder cup, have been a fan of his. I enjoyed it immensely. It will be a book that I will read again as well.
I've tried the cheaper version of these, the aftermarket ones and they are not as good as the Brita ones. You can use these for twice the length of time as the other ones, which is double what they suggest and they still work fine.