Quite honestly, this question comes up all the time and in the end it is always the same answer.
It's up to you.
If you make the change for the rest of your life to eat clean, get out and move and become active, and take full advantage of this tool; then you will not gain your weight back.
If you want it to be a magic trick or miracle pill that makes you skinny and you can eat junk like we do now (or used to) and make no change to your life... then yes, you will gain the weight back.
Now if you fall into the latter category, I don't think you will get much sympathy from anyone. Here or in real life. If you fall into the first category, you will gain self respect and confidence and that will carry over to all aspects of you life. Professional relationships and personal will only be able to improve. The people who are toxic in your life will show their colors quickly, but you will be able to finally brush them off and focus on the ones who are there for your benefit.
This surgery is a life changing event that can have incredible results. If you are brave enough to commit to it that is.