Order this and received it quickly. Popped in an SATA drive, formatted it to NTFS and created the _iso folder required.
With an iso in the folder, the device shows up as a Bluray DVD rom drive on you computer, and a USB hard drive as well. the rocker switch on the side works well, although maek sure you don't knock it while in operation as that switches the iso file. it quickly switches from iso to iso and runs brilliantly. the temperature info on the display is nifty, if a little unnecessary...
It doesn't remember the iso file you selected after power off, so every time i plugged it in and didn't remember to set it to HDD mode only, the autoplay on the iso kicked off and tried to install some programs. I ended up making a blank iso file called aaa.iso with a single text file. that way the drive defaults to this, not an installation iso.
One other thing to note is that the iso files must be contiguous on the drive. If not the drive will say "defrag!!!". run a defragger on it (it seems to like windows defragger the best) and that should sort it out.
All in all, does what it says on the tin, but maybe has slight user interface niggles, but that's to be expected with the first version of niche kit. for me it saves luggin round tons of silly cds.
There's a review on reghardware which gives a good once over on the technical side.