This is my first BT headset, after I got my Sony z525 BT phone, I want a BT headset to work with it, first I was skeptical how this little headset can do ? Then I decide to give it a try, here is my feedback !1. Sound quality on both end is excellent, I use headset to call my wife and ask my wife to use headset to call me !2. I did have issue try voice dialing using headset (no problem voice dialing by phone) in the first couple days and I explore the internet and saw many other reviews voice dialing not working with their Sony cell phone, amazingly, after many days hard work, finally I got voice dialing working on my Sony phone! Because sony cell phone voice recognition software is very picky, you need to be patient and make sure you wear headset to record voice command if you plan to use headset to vioce dial ! (If you have some issue like me, hope this will help ! )