Has Oxford ever published a dictionary that is anything other than great? No. Don't hesistate, it is wonderful. I'm studying wine and it is not my primary book however it does clear up any confusion I might incure between lectures and other books.
The book is basic and a great buy for those that know little about wine. It does not go into the numerical details that will be necessary later on, however omitting those numbers and lists make it a very good introduction to wine. The photos are great and the layout is logical and seamless.