I did the singles routine for a couple of months. Started with a 16kg military press, and made the 24kg feel very easy, with no sleep and working 80+hours a week at the time.
I used the progression model from S&S. An example;
Day 1 - 20,24,24
Day 2 - 20,24,24,24,24
Day 3 - 20,24,24,24,24,24,24
Day 4 - 20,24,24,24,24,20,20,20,20
Day 5 - 20,24,24,24,24,24,24,24,24,20,20
And so on.
When I made all 13 presses on Saturday, I then started incorporating the next size up kb.
I only stopped it because it was working. But I felt it didn't stimulate any size in my arms, so if you're happy with not putting on any weight, then this is a really great program.