I use something very similar to the mediabox, and it is really easy to use. It is basically an external hard drive, but it connects directly to your TV.
I have mine connected to both my laptop and tv, and I download drectly to the exernal drive. When I want to watch something I have to unplug the USB port on my laptop, and then all of my files appear on my tv screen. I just use the remote control that cam with the hard drive to select what I want to watch.
I think it's a great gadget as I no longer have to burn anything to disc.