My sis had RNY in 2005 and is a success story. She is still thin! However, she does have to get iron infusions that are expensive as hell now that she doesn't have insurance anymore. I feel so bad for her. It's a huge strain on her pocketbook and on her schedule. It's a time consuming process.
Not everyone I know with RNY is a success. A couple of ladies I know have regained most of their weight. One lady who was very large though has kept most of it off and I was surprised. I would say I know a mix of success and mix of failures. It's just one of those things. The VSG is bound to have plenty of failures. People eating 12x a day with donuts, cookies, high calorie foods and whatnot are going to gain their weight back even with a smaller tummy.
The VSG's advantage is that we don't run as high of a risk of vitamin deficiency, bowel obstructions, and some other major complications. We may not keep off all the weight 10 years down the road, or we might. It's one of those things that is so individual. But hopefully we at least won't be getting frequent and time consuming iron infusions to top it all off!