The BPD/DS will results in a high percentage of weight loss, more than 150 pounds, because it will restricts how much of the food you can eat & will also reduces how much calories you can absorb.
It will also help to maintain the reduced weight over so many years, probably it is better than either the gastric bypass or sleeve gastrectomy. It will reduce the amount of fat which the body will absorb.
The surgery will also helps to lose weight, if you eat fatty meals also
It will also helps to control diabetes in long term, even better and best surgery when compared with gastric bypass or sleeve gastrectomy.