We've had our flight to America to see family members cancelled and then rescheduled for a couple of days' time. Result, five wasted hours this morning (including two stood in a queue, at the end of which we were basically told to sod off home), extra airport parking charges, potentially useless tickets for an event on NYE and yet more expense for keeping the cat on lockdown for an extra couple of days. We're not massively rich, and it stings a bit to be out of pocket by a sum that could be as much as a hundred quid.
Has anyone had any experience of claiming compensation from airlines? Do they pay up with nary a murmur, or do you generally have a fight on your hands?

