I purchased the device along with a 3TB drive about 6 months ago. When the device arrived I immediately upgraded to v2.02 and installed the drive. All 3TB have been accessible with zero issue in standard mode. Additionally, I added a second 3TB drive yesterday and the system automatically converted everything over to Raid 1 with zero issues (It took about 16 hours to replicate 1.5TB).
Edit: The drives are Western Digital WDEZ30RX "Green" drives. I have no idea what the gigabit xfer rate is, but wireless-n gets me 3-5 MB/s which is sufficient for me.