I want a revision to my lap band is dudenal switch a good wls ?

Much bigger deal: Lap bands are relatively simple, easy to perform, and to remove. They don't have as good a success rate as other ops, neither durarion of success, or amount of wt loss. Gastric bypass, roux en y more common "permanent" surgery. Duodenal switch is major reworking of plumbing; gives greater wt loss, longer, but more complicated and more problems with nutrient deficiencies. Talk with your doc.

Yes: If you fail a weight loss surgery better to find out why.