I have 2 of the S2 units and 4 on the way. So I really like the quality of my S2, solid case, easy setup and just gets the job done. I can't help thinking the way they built this thing with 10 cards all in one power board, there going to be releasing upgraded cards so you can make your box hash faster.
Just my guess. I don't own a dragon miner, but when I read about it and look at the pics, it looks cheap.
Hope this helps.
Rob