To clarify what I'm saying here, I prefer not to go this route because of the medical concerns and my own personal preference. The tube is preferred IMO. That said, it is an ancient custom, and I would not be "against" it for anyone else to do it, it's their choice. The only way I would be against it and say others should not do it is if they had some kind of scientific evidence that it's unhealthy for the baby to have metzitzah b'peh vs a tube. I don't think anyone has done any study on it or is doing any. I would tend to think it is harmless just as the circumcision itself.