I find this excellent. The sound is very good, at least with shape memory bits (basically a bit like earplugs). Isolation is perfectly sealed and freedom of movement allowed by the Bluetooth convenience. I mainly use (if not exclusively) for sports or traveling (plane and train) and I find them ideal for these uses. One of telescopic rods which are fixed on the atria broke, but got a new product immediately. Apparently this incident is very rare.