I did have one catch fire, so have been cautious ever since. Took me awhile after that to get another when DH and I were in Tassie. We found we rarely used it when we were in our old flat in Melbourne, so got rid of it.
Contemplating one again now we are in a colder region. Also thinking of one for DD2. Her bed seem cold whenever I have to lie in it with her, so it might benefit from the warming up before bed. At the moment we use a wheat bag toy when she goes to bed
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