I would be wary of taking too much advice from someone trying to sell you something. If it helps, I had my surgery last September also wanting to drop 140 pounds (310 to 170). Since then, I have lost 80 of the 140 and am still losing.
It is true that it is not a magic bullet. If I stop exercising or ignore the feeling of fullness I will stop losing weight. If you are a binge eater like I was, however, it is a marvelous assistance in portion control. If, on the other hand, your problem is sweets or if yo uare not committed to an exercise plan, you may not see the same kind of success.