Me thinks Advanced and many other 'one time only posters' are all The Count
Mark, the only thing about really using the form book is that it does take time and not everyone has the time to 'really' study the form totally. Also many times people do study the form and just come up with the favourites for obvious reasons.
This is why I find these ratings and the website so helpful as you can get an edge over other punters even just by the horse info and form that is available here.
I am only a small time punter but have had good success so far using Inform so hopefully you can get something out of it if you are a member.
Are you an experienced punter or just betting for fun at present?