Hardware Encryption with Seagate Momentus 5400 FDE Hard Drive

What do you guys (and gals) think about it?
The Seagate Momentus 5400 FDE (Full Disk Encryption) Hard Drive will be out this winter. It's 5400 RPM, 160GB, and 2.5" format.
It's still vapor, but it might offer a good solution to encrypting the OS. Maybe put it in a mobile rack for a 3.5" drive bay.
Do you think it would work for hardware RAID 1 with 2 of the same drive?
Would the keys need to be the same?
Would having two identical drives (RAID 1) with the same key allow easy cryptanalysis?
Because the encryption is done on the drive (keys stored there too) in hardware, it seems like this would be more difficult for an attacker to get around it.

Thanks