I had the 850 and thought that it was decent but could be better so I bought the 700. Let me just say that I own the Motorola V330 and from reading the other reviews, it seems that this headset works best with the razr. That being said, it does not work well with the v330. If you move more than 4 feet away from your phone, you get a ton of static. People tell me that I sound muffled when I'm talking to them. My advice is to only get this if you have the razr otherwise forget it.