I had the SADi / Single Loop DS in Nov 2014 with a BMI of 40. Lost about 150lbs in 10 months, gained about 30 back (needed) and now I'm stable and still thin. The SADi was the right decision because the VSG part of the surgery takes the weight off but the malabsorption keeps it off. If I had the VSG only, a large chunk of the weight would be back on me by now. It would be my fault for poor eating habits but if you at going down this path, I would suggest doing some internal reflection on how long you plan to stick to a hard core diet. I work out now and eat better, but the SADi bails me out for bad decisions and frequent weakness on eating choices.