It's an excellent little enclosure. It looks good, seems to run really well and is quiet. Shipped with foam noise suppressors to mount around the hard drive if needed... nice touch. I'm very happy with it.

It supports Linux straight out of the box -- just plugged it, powered it on and it worked. It will appear as a USB removable storage device.

If you are using a pre-formatted drive in it, the new drive is detected, mounted and is instantly accessible. If you are using a new hard drive in it, you will need to create whatever filesystems (ext3 or vfat etc) you want on it (and optionally create a partition table on it). Use your choice of fdisk/qtparted/gparted.