Review on Etymotic Research ER2XR-BT: Enhanced Audio Experience with Wireless Bluetooth Connectivity in Black by Jerry Bergstad

Very, very good. Super clear sound. memory isolation. Modern Bluetooth connection. You probably don't have any source material to justify this. My only complaint is that it's not obvious which side is left and which is right. You just have to remember that the buttons are on the right side. And often it doesn't matter. Okay, it would be nice if it came with a headphone cable for situations where BT doesn't work or isn't suitable (e.g. on an airplane). However, considering the price, you can spend another $15 on a cable. Stop complaining!