I know 3 people who have had this surgery, and it has worked for all 3 of them.
Of the husband and wife partnership, who have both had this surgery, the wife lost 5 stone and the husband lost 11.5 stone. The husband has maintained the 11.5 stone weight loss, but his wife has put 2 stone back on.
The other individual I know has lost just over 6 stone. She looks absolutely fabulous for doing so and says she doesn't know why she waited so long to have the surgery. She keeps telling us how much healthier and fitter she feels, and how it has changed her life in as much as what she can now do exercise wise and the strain it has removed from her joints, particularly her knees.
I do not know of anyone who has this surgery and it not work for them.
Hope this helps.