At first I thought this headset was horribly uncomfortable. Turns out unlike most headsets, the speaker doesn't go right over your ear, which I was trying to force it to do. It sits higher up on your ear so it doesn't block any outside sounds, and you can therefore wear the headset all the time, and not have it affect conversations with people around you when not on a call.Once I learnt how to use it, it became a breeze to throw onto your ear. It's very comfortable and lightweight. Just wore it back and forth on a 3 hour drive each way, and it wasn't bothersome at all. The sound quality is quite good, and the headset can go pretty loud. I am using the SE w810, and the headset and phone use the same charger, which is also really convenient.The main reason I switched to this headset, was to get an SE headset, now that I have an SE phone, and it sure made a difference. Calls now switch right over to the headset when turning it on during a call. The headset answers immediately when picking up a call, rather than hearing the ringtone in the headset for another few seconds. The volume on the headset and the handset both affect the headset while in use. There's probably other things I didn't notice yet as well, but this headset definitely works great with SE phones.