A very good and comprehensive review of most key aspects of the Acol system. The front cover quotes appropriately from a review in Bridge Magazine "This is a book which is absolutely packed with good material - and when we say packed, we mean packed for not a scrap of space is wasted". This cuts both ways; sometimes it is a little tricky to see the wood from the trees, though in general things are clearly explained. But there is masses of detail here and this makes it an excellent long-term reference. Also, there are lots of quizzes and practice hands, so it is great as a self-learning text (or even for teaching) and very practical. Excellent value for money too.
However, Acol has moved on over the years, particularly in duplicate, and the book has not been updated to reflect this; instead, Klinger has produced a further comprehensive book Guide To Better Duplicate Bridge (Master Bridge). So in "Better Acol Bridge", you will find strong twos, negative doubles, the unusual NT and (briefly) Michaels cue bids, plus Losing Trick Count and many other items, but you will not find transfers, weak twos or "Benji", all fairly standard for improvers nowadays. Also missing (but again in the Duplicate book) are splinters, Lebensohl, Roman Key Card Blackwood and more detail on Michaels. To get the whole current Acol system in a single book, you need something like the EBU's Really Easy Modern Acol although this is much less detailed; it covers the rules but Klinger covers many of the exceptions as well.