I've been on the program for 12 months - and it has worked for me.
In this time my lifts have moved from:
Bench - 315 --> 380
Press - 175 --> 225
Squat - 385 --> 430
Deadlift - 450 --> 520 (Last time I tested, but I am pretty sure it is heavier than that now)
In that time, I have put on about 10lbs going from 180# - 190#