I'm a huge fan of Sennheiser products. I own 2 Sennheiser products and they have been outstanding so far. So I was very excited for this one as well. PROS Excellent audio performance. Generous array of eartips and accessories. Adjustable bass response. Removable cable. CONS Expensive. Snap-on ear hooks don't always stay in place. BEST USES: Music, Audio performance, adjustable bass BOTTOM LINE: I would recommend this to a friend.