The desktop one - when I put my EVO3D on it, it automatically switches to dock mode - landscape view of home screen. It can show the time, slideshow of pictures etc continuously (lowers the screen brightness) - so it works as a night clock as well.
It supposedly supports inline connection of the MHL adapter (sold separately), which permits connecting HDMI cable directly to HDTV <-- I haven't tried this.
To be honest, I had Radioshack credit for $10, and that's really why I ended up purchasing this (I don't see myself purchasing anything else from there). But I like it so far.