VERY slow charging. Not a huge problem (unless you are in a hurry). The cup warmer barely works at all. On my flat bottomed , ceramic mug. If this item worked as well as it should it was a very good deal. As it is, I guess you get what you pay for.

I haven’t tried the charger yet but the cup warmer is definitely a disappointment! Forget keeping something hot it doesn’t even keep anything warm! It barely even feels warm to the touch with my bare hand

You gotta have the phone sideways when charging so you can’t have it charging while keeping the coffee warm. And the warmer keeps turning off