I recently purchased this hard drive enclosure to house my old 400GB hard drive, as I replaced it with a 1TB drive. I'd been looking for enclosures for a while, and I wasn't too bothered about looks or extra features.
That said, it isn't an ugly case. The black design is simplistic and small, basically the dimensions of the hard drive itself. It has a combined power/processing light, and even an on/off switch (to save power, I assume). The choice of power lead is slightly odd, however all leads are included, so it doesn't make too much difference.
Installation was a dream. It's just a case of plugging in the two wires, then two simple screws to hold it together. After that, it took a few seconds to start spinning and a few seconds to install (it's plug in and play, and I've used it so far on Vista and Windows 7 and had no problems at all) and I was away. I copied the old files off the drive, then formatted it, and now I've got 400 extra gigabytes to play with.
As I haven't had it too long (it was only released on 1st March 2010) I don't know how hard wearing it will be, however I don't intend to throw it around, and it claims to have shock protection.
There are however, a few down sides. It does get rather hot, as it doesn't have a fan, which could be a problem it you intend to use it large amounts. Also, the back of box has a spelling mistake, and some suspect grammar, so I don't know what that says about the attention to detail.
In summary however, this is pretty much the cheapest 3.5" enclosure you'll find, especially with free shipping. Installing a drive could be done by an amateur, making it accessible to anyone with a spare drive lying around. If you can look past the heat (and you should be able to, considering you can find enclosures for twice this price without a fan) and the Engrish on the box, you can't go far wrong with this case.