I haven't checked it, but I happen to think that this kind of guide will be more useful for a city like Bangkok, where there are loads of confidentials and hidden joints. As for HK, I think you can find all information in this forum, I don't know what can be the real added-value from the book, except gathering and sorting the information :
With this PDF guide book, the doors of the city are open for you:
Know the best bars and clubs to meet
the hottest chicks in town
Get surrounded by fifty girls, all wanting you!
Explore buildings in search of your Asian courtesan
Indulge yourself with a happy, very happy sauna…
The best addresses, all the fun…
Bars => May be interesting to have consolidated info
Walk-ups => Nothing's better and more updated that this DB... and with the reports, it's even better
Sauna => List + comments on the forum as well, and you may even find the girls' number by PM bros.
So unless you're completely Newbie to HK, not sure you'll need this guide.