I would try it. Like others have said, break the cycle.
I've known a couple people who've had "the surgery" though, and they promptly went off the deep end, and not on a tube. These folks had been morbidly obese their whole lives, though, so I can't imagine what the new lifestyle would feel like.
I've been a yo yo since HS. (No comments from the peanut gallery.)
It's hereditary, but it's my fault for not controlling it. I do find that once I get on a roll as I start to improve it just seems to snowball from there. So, breaking the cycle sounds good to me.
All puns and in-jokes above were intended.