I personally would have no use for this at home, but these are EXTREMELY handy for me at work. Employees find clever ways to completely tank their work computers with malware/virus/adware/whatever and they turn to me to fix their problems. I take their drive, slap it into one of these, and grab the files they still need before I completely wipe the drive.
With this I could do four at one time... now I just need my boss to approve the purchase so I can get one.