I've worked postpartum for 10 years and recently upgraded to a cardio III. While I agree with Klone that you are not diagnosing defects, the cardio III is great because I don't have to use two stethoscopes. I hated using the pede stethoscope for the mom. I would say about 10-12 of our staff bought the cardio III, and everyone loves it. It is a heavier stethoscope though, so just be aware of that. I like that it has a higher acoustic rating as we get a lot of c/s, gyne surgeries and recently medical off services. All in all I recommend it highly!!