I figured the origional $299 price for the 5870 was far too low; $399 sounds about right for something as fast as the 4870X2.
That being said, being *only* as fast as a 4870X2 is somewhat of a dissapointment; basically, they kept with the premier card of the next generation being as fast as the previous X2 model...That's hardly the double performance gains *some* people here were bragging about...