I purchased one as a gift for my significant other. Took FOOOOORRREEEEEVVEERRR to re-heat a cup of coffee. Manufacturer wouldn't accept it back so I repacked it and sold it on ebay and managed to break even.
I wouldn't recommend purchasing.
The secret of a good life is to have the right loyalties and hold them in the right scale of values.
Norman Thomas (1884 - 1968)