I work in a retail camera store, and we use Huey on our print kiosks, they work pretty slick for keeping on top of the changing lighting enviroment of our "print lounge" (we have pretty big windows nearby). For uber-cheap I'd say it's better than nothing, but I like Monaco EZ/Color Optix for relatively inexpensive Monitor-Scanner-Printer calibration.
My 2cents.
cheers,