It should work fine as long as the case is not too thick. Otterbox type cases might be too thick as might flip covers that also hold credit cards. Thin feather-like cases such as TPU/Gel cases, those snap on 2 piece cases and such should be fine.
Works fine for me but I don't have a super thick case. I also use the fast wireless charger and not one of those from eBay or Amazon. I do have those but I notice those tend to be hit or miss with certain brands of phones and devices.