When I first picked this up at the start of the LPC in my College library I was put off by the book's twee and patronising tone. For example: "Some lawyers are very idiosyncratic and however quirky they are you will simply have to accept many of their oddities: the compulsive shining of the shoes before a meeting with clients; the loud crunching of apples at precisely 11.30 and 3.30 every day...." (page 142)
However, once you've got over these occasionally unreadable passages, you'll see that much of the book contains useful common sense - the sort that you could probably do without, but that it would be just as well to be reminded of.
One of the key messages of the book is that law firms are like small villages where everything you do is remembered and nothing will ever be forgotten - so don't burn bridges; don't shout at support staff, and so on, because it'll only come back to haunt you. Were you going to do those things anyway? Well, probably not.
I bought it in the end, ahead of starting my training contract at a large City firm. The list of further reading at the back has some very good recommendations too.
The authors claim in the introduction: "We spoke to training and graduate recruitment managers and asked them what they wished trainees knew when they started in law firms; we asked partners what skills, knowledge and attributes they wanted to see in the best trainees. When we showed our book to newly qualified solicitors they told us, without fail, how useful it would have been if they had read it before they started their training contracts."
Can't hurt to read it, I'm sure.