Make sure if you're doing that program, that you're writing down your objectives and intensities before your workouts so you don't waist any time. Be honest with your intensities. Once you've master 12 reps on the last set for a maximum intensity of 10 it's time to go up. If you go up and can't do the recommended number of reps in the last set, after moving up; stay there until you can master it. Try not to readjust down, unless there's now way you can handle it.

When I did that program I actually had very good results, because I followed the program to the best of my ability. Like any program stay with it for the required number of weeks. In this case 12 weeks, and don't miss any workouts. When you finish, look for a new way to workout. If you end up bulking your weights will go up. Remember, it's now how much you lift, but what's happening when you're lifting. Good form is critical, and pushing yourself more than you think is possible will always give you good results.

Also, make sure you have, or plan to read the whole book. People often short change themselves by doing things half-assed, and wonder why they don't get results, or quit because they say it's not working.