Its good for storage, speed is not good, quality is OK, 2TB drives aren't very reliable vs 1TB ones... I decided to go 2x 1TB 7200.12 RAID 0.... fast (200MBps average) slow access times (16ms) reliability probably a lil bit worse than 2TB drive but that is it...
WD green should have like <90MBps, similar access times to the 7200.12 wouldn't surprise me
EDIT: 74.7MBps and 17.3ms on HDtach 80MBps and 14.3ms on HDtune