This is a spectacular stethoscope. Its as lightweight as you could ever find. ADC is very comparable to virtually any Littman product as far as I am concerned. They have great customer service if you have any questions. Never have had any problems with my original scope and this one is doing a great job so as for fixing or replacing parts I cant say anything good or bad. But to give you an idea of the quality, I still own my first ADC scope that I purchased in 1999. It still works and looks as good as it did the day I took it out of the box. Havent replaced the diaphram or ear peices. And the scope didnt just lay around in a box, it was used 4-5 days a week all throughout the work shift. Buy one, you wont be disappointed, unless you paid big bucks for a Littman first.