Well, after one semester, I've decided I hate my Littmann Lightweight and I'm in the market for an upgrade. I know the Master Classic has more features, but as far as acoustics, does anyone know if it is equal to the Classic? I'm willing to pay the extra $20 or so for the Master, but not if the only extra feature is the tunable diaphragm, it's not that big of a deal to turn it over. I plan on getting a Master Cardiology 'scope when I graduate anyway (wish I could afford it now!), so that'll be 3 stethoscopes in 2 years! So, owners of the Master Classic and Classic 2, please weigh in with opinions on your stethoscopes! Thanks!