Has anyone heard about Dr. Jaime Ponce de Leon?
I know that I personally wouldn't trust any bariatric surgeon anywhere who claimed a complication rate of 0.0003 %, or whatever ridiculously low number you say he claims (read it on your page). Bariatric surgery is major surgery done on patients who are not, in general, low risk. Reputable, experienced bariatric surgeons in the USA will quote complication rates of over 20%. Of course, that includes minor complications as well as the major ones, but still, no one has a complication rate of less than 1%. It just isn't possible.
I don't know what operation you are considering. There are definitely reputable bariatric surgeons in Mexico. If you are interested in the DS (duodenal switch), the surgeons to contact would be Dr. Ungson or Dr. Aceves.
Larra