I was under the impression that men were allowed 600 calories and women were allowed 500 on the diet (2 out of 7 days). In order to follow the diet correctly, calories in need to be counted. Not being difficult, but the diet is based on restricting calorie intake to 500/600 so counting is required. It's still a counting based diet...
I have not counted calories other than identifying what a 200 calorie meal looks like and have lost nearly 10kg.
I'm out riding to day an will have big breakfast, tea and cake for 11's, pub lunch, tea and cake for 3's, banana and milk when I get home and substantial evening meal. Tomorrow will be 3 * approx 200 calorie meals.
The 5/600 rule is itself an approximation. The real "rule" is 25% of normal daily intake. Thus, if the 5/600 rule is an approximation, sticking too it rigidly is pretty pointless. Awareness of calorie load of foods and designing approximate meals are more important than strict counting. I cite my 10kg loss as evidence - lost over a period including 2 fully catered skiing holidays, Xmas/New Year, a month of a chest infection with normal appetite but no exercise, multiple dinner parties, both kids home at Easter so big family meals and a family wedding weekend. I have no idea whether on a particular diet day i am 200 calories up or down on my nominal 600.