Hello, Thank you for your question. I will answer the easy questions first. Orbera is one Balloon. Reshape is a double balloon. Obalon consists of three balloons inserted at two weeks intervals. None of them dissolve. In my practice, the balloons cost $8,000 and I do offer a package that includes reinsertion over the course of a year and a half. As for concerns to be aware of. My opinion is that the most important question is whether you are a better candidate for gastric sleeve. In addition to not demonstrating the long term benefits proven in studies on gastric sleeve and other bariatric surgeries, the balloons do no have the same immediate impact on blood glucose levels (diabetes) as the gastric sleeve and gastric bypass surgeries. Also, if you are to undergo multiple balloon insertions, it is likely more cost effective to undergo surgery rather than balloons. Whichever you choose, it is essential that you have a weight loss team complete with a dietician, emotional and psychological support, and exercise plan. A Skype consultation with a bariatric surgeon will answer your questions and help you determine the best treatment for you weight loss goals. Best wishes, Dr. Moein