Here are some links for you to look through.
This is interesting in that the LapBand patients long-term assorted into two types when you plot weight:
"It has been our perception that the weight loss results after gastric bypass are relatively normally and tightly distributed around the mean, making it relatively predictable. However, we have found that the results after adjustable gastric banding are more highly variable. In fact, there appears to be 2 groups of patients after this restrictive operation. One group, that is able to work well and does not struggle much against the restriction, accepts the limits that it imposes, and another group, that does not easily learn to deal with the restriction and hence mal-adapts."
"The placement of a gastric band appears to be a disservice to many morbidly obese patients and therefore, in the current culture of evidence based medicine, the prevalent use of laparoscopic gastric banding can no longer be justified."
"However, because nearly 1 out of 3 patients experienced band erosion, and nearly 50% of the patients required removal of their bands (contributing to a reoperation rate of 60%), LAGB appears to result in relatively poor long-term outcomes."
"LAGB can achieve an acceptable weight loss in some patients, but the failure in one out of four patients does not allow proposing it as a first-line option for the treatment of obesity."
"Of the study population, 146 (52.9%) patients had at least one complication requiring reoperation. Presently, only 148 (53.6%) patients still have their original band, 49 (17.8%) had their original band replaced with a new one, and 79 (28.6%) had their band removed."
"The percent of excess weight loss at 4 years was higher in the gastric bypass group (68 ± 19% vs. 45 ± 28%, respectively, P < 0.05)."
7 year study on lapbands, with SOME patients converted to RNY:
"Patients converted to gastric bypass, and those retaining gastric bands throughout the study had very similar outcomes."