from what I've read, about 30% of sleevers have or develop reflux, but it usually can be managed medically (e.g., with PPI's such as omeprazole). There are some who have it so severely that they end up revising to bypass - I don't know the percentage, but I don't think it's huge. It may appear that there are more people who revise than actually do, because people post about it. Those who don't have issues aren't as likely to post about it. Your surgeon may know the stats, though...