We have been using CCO swans for some time now. It is the most popular swan, since we don't have to shoot manual outputs. It is more manageable if you hook it up to an H connector so you can get CVPs at the flip of a stopcock. The biggest drawback is that the more fiberoptics you add, the greater incidence of swan failure (ie low light intensity. also not working when temp out of range. Simple oximetrics aren't used that much anymore in our units.