My CTM-300 Pros were delivered in June 2012... almost have had them for 2 years. I use them every day for at least 2hours, and have had them in for 6-hour flights numerous times. I bought them based off the CTM-200 reviews, but was hoping for a little more low end, and I was not disappointed. Bass is not overwhelming, boomy or muddy at all. They work great with my iPhone 5, 5S, and my HeadAmp Pico. I love them and would buy another pair in a heartbeat. Anything specific questions?