I've never had one, other than in student digs a zillion years ago. My mum always told me they were common 
and meant you weren't cooking properly. DH not a big fan either, so we've just never had one.
I don't have room for one in the kitchen, and also they are damned ugly, so I don't want one on show. But in my newly laid out utility room I would have room to put one on top of the washing machine. Everyone I know seems to have one, and people have always been amazed when they came round with our DC were younger that they then couldn't heat up their bottles/baby food or whatever. Am I missing out?
But, I'm not sure what I would really use it for? I wouldn't spend much money on one either, so if it is one of those things that is rubbish if you buy a cheap one, then I also need to know this!
Thanks.