Has anyone tried the "FlightWall"?

I've been dreaming about someday setting up my own ADS-B "nearest planes" display, and then "www.theflightwall.com" shows up in my Facebook feed, offering to import flight data from the web (yes, could be a minute or two old) and display up to 5 flights within a radius of a selected location. So it seems like this would let me pay to avoid the integration and setup work, and not need an antenna at my window or outside. Has anyone else tried this yet? Is it any good? (I especially like the chance to notice a Cargolux 747 once in a while.)