With increasing disk capacity (1 Tb is a lot), reliability becomes more and more an issue in single disk storage. Backups of 1Tb disks in single disk mode is a bit of a pain.
Time will tell for the HD103UJ. Only dare to use them in RAID config. Many issue’s seem to point to SATA-2 compatibility, which manifests itself in early use of the disk. The head clicking, the high operating temp etc, doesn’t sound good.
Keep an eye on SMART attributes, assuming the function is implemented without glitches.