I purchased the Eko stethoscope as a Christmas gift for my daughter who is a veterinarian at at a large animal hospital that is staffed with a team of doctors, most of whom are specialists. She had told me she needed new tubing for her Littmann and was so surprised when she opened her gift. She'd never seen one like it and was "wow'd" when she put it on. She exclaimed "It's so loud, and clear!". She told me that when she took it to work it caused a small frenzy and was the talk of the day. She and the other doctors absolutely love it and she told me the app is amazing too. She was so impressed with it that she posted a photo of her Eko gift on her Facebook page to show her gratitude and to give me "dad kudos".