I bought a Wireless Receiver on eBay to use my 360 controller on PC, but it turns out it was one of those knockoffs that only says "XBOX360" on the device.
As expected, it did not work. Syncing the controllers was impossible. I tried 3 controllers and all 3 did not sync. Tried different computers, everything, and no luck.
So yeah, in short - Only buy the Microsoft products, don't buy the knock-offs unless you like wasting your money like I just did.