One last comment - just in case anyone comes here from a Google search...
The reception quality of the receiver is easily improved to that of most chinese-made commercial 433mhz products by winding up some .6 mm (~22-24 ga) wire into a coil as shown here:
The reception went from horrible-to-barely okay to.. just as I would expect any 433mhz device to perform in an average home. Easily reaches over 30 meters now - and even penetrates multiple concrete walls.
All in all, hope the next person pulling their hair out finds this useful. My journey today took me from about to throw all the receivers out to considering buying another 5-pack for the next project.