Default Rearview (parking) camera for Nexus car installation

As the title suggest I recently found out about a wi-fi camera that's designed for use with all android devices (in ebay...search for "wifi backup camera")....it even comes with its own app...

I am about to install a 2013 Nexus in my Mazda 6, and thinking of buying it, instead of removing half the interior to install RGB cables...
Has anybody used it so far?? It definitelly looks very promising...