I have been doing it for three years now and I have tried several different assistance work styles, as well as 3 and 4 days per week.
I can honestly say that the most important part of the program is the main lift. Once I started to understand this, the accessory work became less important and I started to make much better gains. I am doing less accessory work now than I ever have, and my strength is doing well because of it. I can't say much for size, as I have been dieting for the last 12 weeks via carb-cycling.
I have also been getting all 4 main lifts in every week, either from training 4 days a week or combining the military press/deadlift days. I used to do 3 days a week, so each main lift would repeat every 9-10 days. This approach didn't do much for me.
I will be switching to a density bulk shortly, so I am anxious to see how my minimalist approach works in the size department.