For Only $38 shipped, it was definitely worth a shot. I ordered it from HERE (eBay) on August 2nd. It finally arrived today (August 21st) and I immediately unwrapped it and got it installed.
I'm happy to say that it works flawlessly with both the Tylt Vue Wireless Charger and LG WCP-700 Wireless Charging Pad.
I tested it both without a case and with a TPU case so I can confirm it will work just fine with a case just like the Nexus 5 did. For those curious, the new wireless back is the exact same dimensions as the stock one and clips right into the phone just the same.
Overall: It's perfect and works exactly as intended. I recommend this to anyone wanting to get wireless charging enabled on their G3.
Now on for some pics...