After reading four reviews I have come away with the following ideas.
1. Sapphire is the only manufacturer that will be making this card. As such the HD 4850 X2 will not get its own page.
2. The card is competitive with or better than a single GTX 280 depending on the game. If Driver Heaven is correct about the price of $419 (Overclockers Club says $350), it will be cheaper than almost any GTX 280.
3. The card is very loud when operating under load but the card does stay very cool.
4. The drivers need some improvement.
5. The card is long (long card is long?), a full one inch longer than the GTX 280.