been using this for a couple of weeks. stays "warm" pretty long (as advertised) but actually the temperature drops gradually so towards the end it doesn't help as much. find it helpful by putting them near my hands/feet when i just hop into bed - i have freezing extremities. also use it when i'm using my laptop cuz my right hand gets extra cold (it has to hold the mouse whereas i can put my left hand nearer to my body warmth if u know what i mean). bit of a hassle to have to boil it for re-use, otherwise so far so good. also stays warm for quite long after u boil it.
