Uggs are comfy. I use mine mainly for around the house, where obviously I don't really care if my actual feet look stylish, because I'd be wearing some kind of slippers no doubt if I weren't wearing uggs, and unless you have the high heeled pom pom sort (!) or wear street shoes, you are going to look kind of relaxed at home anyway.
I occasionally pop to the shop for a pint of milk or do the morning school run in them if I'm not going somewhere straight afterwards.
Not that I'm justifying wearing Uggs to anyone - they are warm and comfortable, so in winter there is nothing to justify, however, if anyone has been pondering a pair of Uggs and is worried about the style element, if you consider those uses, you don't really need to ponder it too deeply, and you too will be able to enjoy the immense warmth and comfort.
By the way, you don't have to pay £140 for "real" Uggs, just make sure they are genuine sheepskin and have a reasonably firm bit of hold around the back/heel area.