So sorry for your friend. I hope she heals and gains her health back.
Lapbands can erode, twist, cause scar tissue and so many complications, she may have had someof those problems. You will never have those pre-existing issues for your surgery. You can ask the surgeon for his complication rate, what type, has he had to do any repairs and under what circumstances, etc. The complication rate is very low, lower than gallbladder surgery.
Take a deep breath. Make a calm and informed decision. I wish you well.