I'm diagnosed BPD & contrary to much of the opinion here i DID find this book , for the most part, helpful.
Yes, it is written as though aimed at family, friends, colleagues etc but that doesnt mean it isn't useful for Borderlines as well. In fact i can accept some of the harsher realities of my Personality better when read as though in the third person as it is equally as informative but much less condemning that having the author tell YOU how wonky YOU are.
The book contains many, many case studies & real life accounts of Borderlines which i always find interesting - especially when you read how these people have found ways to deal with their behaviours & thus improve their relationships.
Contrary to one opinion here i think the book does give hope for recovery - i'm not sure BPD can ever be called cured but i believe we can certainly learn the skills needed to recover & lead much more fulfilling lives. This book details the SET principle - though this is something to be used by those dealing with Borderlines, not really Borderlines themselves.
I agree the book is showing its age, it makes no mention of modern therapeutic practices such as DBT in the treatment of BPD and the pharmacotherapy section is pretty outdated now too.
However i would recommend this book solely on its section regarding coping and dealing with the Borderline, it explains why we behave how we do & how best to deal with us when we are being difficult. I imagine there is more thorough literiture on dealing with us out there but this is a good start.
To sum it up in a nutshell... outdated but still worth a read.