Macrojack: As for waiting to see what else Zu will make in the future, why? Are you going to walk until you are convinced that Ford or Toyota or whoever has finalized the automobile.
I can only explain how I feel, each person must decide for himself.
Your analogy would be on the mark if somebody was listening to a clock radio, and waiting for Zu or whoever to come with a perfect speaker. However, most of us already have a speaker that we love, that we found after much search. We know we will upgrade someday and are always looking at potential candidates but it is not like we don't have good or even great speakers.
To come to your analogy, I already have a Camry or Lexus or BMW or whatever each of us can afford. Prius is impressive new technology but I think it will mostly be a sideways move for me and anyway I hear Toyota and others are about to come out with new hybrid models. So I decide to wait and enjoy my present car a little more.
I don't know if this makes sense to others, but that is how I feel.