I have worked in healthcare for 26 years, I can auscultate lung, heart and bowel sounds quite well. I read several reviews before purchasing this stethoscope and it is frequently compared to a littman. Lets look at them side by side the only difference I see is the MD is made in China. Therefore it is a littman knockoff in my view. With the quality I see with the MD it is well worth the money and it includes a lifetime warranty and parts. Hard to beat for $55.