I'm a bit curious about this case as well. Since I have both the FT02 (main gaming machine) and the TJ08-E (light gaming/htpc), I'm a bit impressed with Silverstones AP181 and the airflow/noise ratio in these cases with the AP181 (after putting fans on a fan controller with FT02 and a resistor for the fan on the TJ08-E).
My biggest gripe with the TJ08-E is the hard drive cage. Since its a HTPC, I can forgive noise a bit more, but I have considered more then once to let the whole cage rest on some silicon and attach it with zip ties or something instead.
The FT04 seems to have the same cage. I'm going to use it for a gaming build, so I can get away with having an SSD for OS and a mechanical hard drive for storage. But, the bottom cages doesn't seem to offer a good solution against hard drive vibration. I could remove one of the bottom cages and tie the hard drive down on some foam in the bottom, but then I'll loose the CPU cooler support.
If anyone gets this case, I would appreciate if someone could test the native HD solutions and see if there is any rattle or vibration noises.