What has been your experience with 40-50% protein?

As we all know, the main message is that beyond a certain amount of grams, protein does not provide much additional benefit and calories can be allocated to carbs and fat. However, in my limited experience when I lost weight, high high protein can transform one's physique. Maybe there just aren't enough properly controlled scientific studies with large enough sample sizes to support this? What has been your experience going from the recommended 1g per pounds of lean body mass vs allocating 40-50% of daily calories while either at maintenance or in a surplus?