Ive had all 3 GZ one's. If I still had a working older one, I wouldnt be in a hurry to get the Boulder. The battery life is about half of the second gen GZ one and people complain that they can't hear me talking unless I'm holding it just right. On the upside, the speaker is way better on the Boulder and it is smaller and lighter than either of the earlier phones The electronic compass is 'over the top' cool.