I've tried three types of steths, a Littmann Classic II SE, a Littmann Master Cardiology, and a Welch Allyn Harvey DLX. I've used the Classic II SE quite a bit and really liked it. It's a pretty basic steth, and I sometimes had trouble with the tunable diaphragm (okay, it annoyed me sometimes), but it worked for me in the field and on loud ambulances. I had to buy the Harvey DLX for medical school, which I thought I'd like better because it didn't have the tunable diaphragm, but I didn't like it at all. I just didn't like the feel and somehow I could never get the same sound quality from it that I normally got from my Classic II SE, even though it is supposedly a better steth. I was pretty unhappy with the DLX, so I decided to buy one that I could use that had a double lumen (the Classic II SE is only single lumen). I found a good deal for the Master Cardiology and decided to splurge and buy it. Wow. I know it's way overkill for what I need right now, but I can hear heart, breath, and bowel sounds through two layers of clothing even better with the MC than with either the Classic II SE or the Harvey DLX on bare skin. I don't care if it's unnecessary firepower; my ears appreciate it.