My wife and I both had Ruen-Y Gastric Bypass. She's about 3 1/2 years post-surgery; I'm about 2 3/4 years.
I have two coworkers who've had WLS. One had Ruen-Y; the other had lap band. The lap band coworker is, today, in fact, having a Ruen-Y because the lap band didn't work for her.
IF patients follow their post-op doctors' advice on diet, vitamin supplements, etc.... there is almost always tremendous results. After people stop following their doctors' advice, they typically rebound on their weight some - and either go back to eating and drinking how the doctors taught them, and lose regained weight and plateau, or they get back into bad habits and their success is short-lived.
If your wife uses WLS as a life-changer: changing her relationship with food; changing her lifestyle choices.... she'll have great success.