I guess I am one of the folks who has been having lots of trouble with the new advanced kits, having a tough time getting the suction to work evenly. I spoke with Medela about it at ILCA and they are going to take all my kits back and replace them, apparently because there was a batch that didn't quite work correctly. The rep called today and will come and get them. I hope it is only my batch.............. Ann Calandro Waxhaw, NC