I am very happy with this part. One star deduction for the too short USB cable (1m) 1.5m should the USB cable already be long, my I have exchanged a 2m cable. On the data-transfer rate, the longer USB cable has no influence. When you copy a 3 GB file remains the rate more than 100 megabytes / sec. The 3-speed fan and the LED light is within the normal range, the final stage but is clearly audible. As the device only occasionally for a short period is in use, it hardly bothers me.
I use the FANTEC QB-35US3-6G once a week for about 1 hour and there were always all 4 hard drives detected. What I lack is the single startup of certain hard drive. Unfortunately, all hard disk will go to when you turn, even the ones I do not need.