I'm confused by all the negative comments. First, for the price, I expect a no frills backup device, not a high end box to stream 1080P video flawlessly or some of the other advanced functionality I have seen in these posts. Second, the 321 seems silent to me. It is in a quiet office space in my home, and I still don't hear a thing. Third, I have twice needed to call for support, and both times a skilled technician answered the phone in about a minute and quickly resolved my issue. The first time it was the need for a firmware upgrade to support the 1.5 TB drives, and the second time a power surge caused my box to get a little confused. Both times the issue was resolved quickly on the first call.
I really appreciate a company that actually responds to issues raised in their forums. I think this is rare these days. I also really appreciate getting excellent customer service even well after I purchased the device without waiting forever on hold.
Yes, my Mac sometimes drops the connection, and if this is an issue, you should look for something else, but you will also pay a lot more for it. We use this box to store videos that we don't access every day anyway and to do manual backup of very large files. In both cases, our work requires human intervention anyway, so one extra click to reconnect is no big deal. For $99, there is no competition.