I'll come right out and say it: I think it's a positioning issue. My VP100 doesn't sound nearly as good if it is firing straight out from the TV. Flipped over on its back is better, and even better is pointed at the listener.
While you could try a center from another manufacturer, you'll likely have the same issues if you're restricted in placement. A reason not many people have replied on this line is that not many people (not anyone currently active?) have gone that route.
What exactly is it that you are missing? Is the dialog not centered on the screen? Is the volume level off from the other speakers? Is the dialog unclear? Does it not have bass impact that you expect? If you play music through it, does it sound different from the other speakers in some way?
