Ease of installation is one of the key elements in choosing an external hard drive enclosure. USB 2.0 or eSATA or FireWire connectivity does not matter much as the speed of the three when it comes to external enclosure is neck to neck; rather the hard drive size and speed determine the actual real-world performance.
If you prefer "Silver" over "Orange ....
Removing the 4 screws at the bottom of the case, the hard drive tray can be slided out.
There is a 5-pin connector that must be disconnected before the entire tray can be slided out.
Once the tray is out, a bag of screws for the hard drive mount is taped to the tray. Installing the hard drives is as easy as sliding the hard drives into the plugs on the PCB, there is no power or SATA cable to deal with. Secure the hard drives with the screws provided and you are done.
Now I must question the effect of the fan, since it is mounted right behind the PCB blocking any possible air flow to the hard drives.
As you can see in the photo above; the fan and PCB location leaving the cooling for your imagination.
I installed a single drive in the lower slot; can't be easier.
Two mount screws on each side of the tray; I did encounter a slight problem when I was reinstalling the cover. The four screws are pretty short, since there is no rail inside the cover, the tray with hard drive will drop slightly thanks to gravity as I turned the unit upside down to tighten the screws. This becomes a challenge and I finally got a handle of it after 10 minutes.