I did not have any issues with the phone sliding off the disc when vibrating from notifications, as the rubber circle on the surface of the charger provides good grip against the relatively smooth surface of the Fre case.

I never have issues with it not working or having to adjust the placement on the pad

and I've got the "slow charging" issue when plugging a USB C cable

The heating up issue was worrisome as the light went from white to yellow on the Belkin Qi disk

But if your phone has a cover its super easy and convenient since you wont have any uneven issues caused to do the camera.

I've had no issues with the placement of the iPhone on the charger and love the green indicator light.